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