boy_girl.cpp

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

    return 0;
}