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#include <iostream>
#include <string>
 
 
using namespace std;
 
int main() {
	//string1
	//char c;
	//cin >> c;
	//cout << (char)(c - 1) << ' ' << (char)(c + 1);
	//string28
	//string s;
	//cin >> s;
	//char c;
	//cin >> c;
	//cout << s << ' ' << c << endl;
	//int i = 0, len = s.length();
 
	//while (i < s.length()){
	//	if (s[i] == c){
	//		s.insert(i, 1, c);
	//		cout << s<< endl;
	//		i++;
	//	}
	//	i++;
	//}
	//string52
	string s;
	getline(cin, s);
//	cout << toupper('a');
	char c = ' ';
	for (int i = 0; i < s.length(); i++){
		if (isalpha(s[i]) && (c == ' ')){
			s.insert(i, toupper(s[i]));
		}
		c = s[i];
	}
	cout << s;
    return 0;
 
}

prog.cpp: In function ‘int main()’:
prog.cpp:35:29: error: no matching function for call to ‘std::__cxx11::basic_string<char>::insert(int&, int)’
    s.insert(i, toupper(s[i]));
                             ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:1533:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_iterator, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::pointer = char*; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_iterator = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::const_pointer = const char*; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
       insert(const_iterator __p, size_type __n, _CharT __c)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1533:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/8/bits/basic_string.h:1577:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_iterator, _InputIterator, _InputIterator) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
         insert(const_iterator __p, _InputIterator __beg, _InputIterator __end)
         ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1577:9: note:   template argument deduction/substitution failed:
prog.cpp:35:29: note:   candidate expects 3 arguments, 2 provided
    s.insert(i, toupper(s[i]));
                             ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:1611:7: note: candidate: ‘void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator, std::initializer_list<_Tp>) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::pointer = char*]’
       insert(iterator __p, initializer_list<_CharT> __l)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1611:7: note:   no known conversion for argument 1 from ‘int’ to ‘std::__cxx11::basic_string<char>::iterator’ {aka ‘__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >’}
/usr/include/c++/8/bits/basic_string.h:1631:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
       insert(size_type __pos1, const basic_string& __str)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1631:7: note:   no known conversion for argument 2 from ‘int’ to ‘const std::__cxx11::basic_string<char>&’
/usr/include/c++/8/bits/basic_string.h:1654:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
       insert(size_type __pos1, const basic_string& __str,
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1654:7: note:   candidate expects 4 arguments, 2 provided
/usr/include/c++/8/bits/basic_string.h:1677:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
       insert(size_type __pos, const _CharT* __s, size_type __n)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1677:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/8/bits/basic_string.h:1696:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’ <near match>
       insert(size_type __pos, const _CharT* __s)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1696:7: note:   conversion of argument 2 would be ill-formed:
prog.cpp:35:23: error: invalid conversion from ‘int’ to ‘const char*’ [-fpermissive]
    s.insert(i, toupper(s[i]));
                ~~~~~~~^~~~~~
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:1720:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
       insert(size_type __pos, size_type __n, _CharT __c)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1720:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/8/bits/basic_string.h:1738:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::insert(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::__const_iterator, _CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::pointer = char*; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::__const_iterator = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::const_pointer = const char*]’
       insert(__const_iterator __p, _CharT __c)
       ^~~~~~
/usr/include/c++/8/bits/basic_string.h:1738:7: note:   no known conversion for argument 1 from ‘int’ to ‘std::__cxx11::basic_string<char>::__const_iterator’ {aka ‘__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >’}

Standard output is empty