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