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