#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  sort(s.begin(), s.end());
  int cnt = 0;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] != s[i + 1]) {
      cnt++;
    }
  }
  if (cnt % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
