#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int myStrlen(char s[]) {
    int i;
    for(i = 0; s[i] != '\0'; i++);
    return i;
}
 
// 関数の中でtmpに対してmallocして
// そこに回文を代入してreturnで返しましょう
char *setPalindrome(char s[]) {
    char *tmp;
//以下に必要な宣言を含めて書いてください
    int len = myStrlen(s);  
 
    tmp = (char *)malloc((2 * len) * sizeof(char));
    if (tmp == NULL) {
        fprintf(stderr, "Memory allocation failed\n");
        exit(1);
    }
 
    strcpy(tmp, s);
 
    for (int i = 0; i < len - 1; i++) {
        tmp[len + i] = s[len - i - 2];
    }
    tmp[2 * len - 1] = '\0';  
 
    return tmp;
}
 
//メイン関数はいじる必要はありません
int main() {
    char nyuryoku[1024];  
    char *kaibun;         
 
    if (scanf("%s", nyuryoku) != 1) {
        fprintf(stderr, "Input error\n");
        return 1;
    }
 
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
    free(kaibun);
 
    return 0;
}
 
 

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