#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int res = 0, ans = 0;
  string s, q;
  bool tr = false;
  cin >> s;
  long long int n = s.length();
  q += s[0];
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < q.length(); j++) {
      if (s[i] != q[j]) {
        res++;
      }
    }
    if (res == q.length()) {
      q += s[i];
    }
    res = 0;
  }
  long long int qwerty = q.length();
  if (qwerty % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else
    cout << "IGNORE HIM!";
  return 0;
  system("pause");
}
