#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  set<char> a;
  for (char x : s) a.insert(x);
  if (a.size() % 2 == 0)
    cout << "CHAT WITH HER!" << endl;
  else
    cout << "IGNORE HIM!" << endl;
}
