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