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