#include <bits/stdc++.h>
using namespace std;
int main() {
  char buffer;
  set<char> dict;
  while (cin >> buffer) {
    dict.insert(buffer);
  }
  if (dict.size() % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
  return 0;
}
