#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<int> a;
  a.resize(28);
  int n, sum = 0;
  string qwc;
  cin >> qwc;
  for (int i = 0; i < qwc.size(); i++) {
    a[qwc[i] - 97]++;
  }
  for (int i = 0; i < a.size(); i++) {
    if (a[i] > 0) {
      sum++;
    }
  }
  cout << (sum % 2 == 0 ? "CHAT WITH HER!" : "IGNORE HIM!");
  return 0;
}
