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