#include <iostream>
#include <string>
using namespace std;
int main()
{
    int q;
    char n;
    string a;
    cin>>a;
    q=a.size();
    for (int h=0;h<a.size();h++)
    {
        n=a[h];
        for (int p=a.size();p>h+1;p--)
        if (a[p-1]==n&&a[p-1]!='5')
        {
           q--;
           a[p-1]='5';
        }
    }
    if (q%2==0)
		cout<<"CHAT WITH HER!"<<endl;
	else
		cout<<"IGNORE HIM!"<<endl;
}