#include<bits/stdc++.h>
using namespace std;

main()
{
    string input_string;
    int sort_by_ascii[100], count=0;

    cin>>input_string;

    for(int i=0; i<input_string.size(); i++)
    {
        sort_by_ascii[i]=input_string[i];
    }

    sort(sort_by_ascii, sort_by_ascii+sizeof(sort_by_ascii)/sizeof(sort_by_ascii[0]));

    for(int i=0; i<input_string.size(); i++)
    {
        if(sort_by_ascii[i]!=sort_by_ascii[i+1])
        {
            count++;
        }
        while(sort_by_ascii[i]=sort_by_ascii[i+1])
        {
            //repeatation logic?????
        }
    }
    if(count%2==0)
    {
        cout<<"CHAT WITH HER!";
    }
    else
    {
        cout<<"IGNORE HIM!";
    }
}