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