#include <bits/stdc++.h>
using namespace std;
int main() {
  string username;
  cin >> username;
  int dchars = 0;
  set<char> chars;
  for (int i = 0; i < username.length(); i++) {
    if (chars.find(username[i]) == chars.end()) {
      dchars++;
      chars.insert(username[i]);
    }
  }
  if (dchars % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
  return 0;
}
