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