//my code
#include <bits/stdc++.h>
using namespace std;
int main() {
string s;
int count=0;
cin>>s;
sort (s.begin(),s.end());
for(int i=1;i<=s.size();i++){
if (s[i]!=s[i-1]) count++;
}
if (count %2 ==0) cout<<"CHAT WITH HER!";
else cout<<"IGNORE HIM!";
return 0;
}
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