#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int count = 0;
  for (int i = 0; i < s.size(); i++) {
    bool flag = true;
    for (int j = 0; j < i; j++) {
      if (s[i] == s[j]) {
        flag = false;
        break;
      }
    }
    if (flag) count++;
  }
  if (count % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
