#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  long long int len = s.length();
  vector<long long int> ans(26);
  for (long long int i = 0; i < len; i++) ans[s[i] - 97] = 1;
  long long int cnt = 0;
  for (long long int i = 0; i < 26; i++) {
    if (ans[i] == 1) cnt++;
  }
  if (cnt % 2 == 0)
    cout << "CHAT WITH HER!";
  else if (cnt % 2 != 0)
    cout << "IGNORE HIM!";
}
