#include <bits/stdc++.h>
using namespace std;
int main() {
  string x;
  getline(cin, x);
  sort(x.begin(), x.end());
  int res = unique(x.begin(), x.end()) - x.begin();
  if (res % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
  return 0;
}
