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