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