#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  string s;
  cin >> s;
  bool chk[27]{false};
  int cnt = 0;
  for (auto &c : s) {
    int index = c - 'a';
    if (chk[index] == false) {
      chk[index] = true;
      cnt++;
    }
  }
  if (cnt % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
