#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int k = s.length(), c = 0;
  for (int i = 0; i < k; i++) {
    for (int j = i + 1; j < k; j++) {
      if (s[i] == s[j]) {
        c++;
        break;
      }
    }
  }
  if ((k - c) % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
}
