#include <bits/stdc++.h>
using namespace std;
int main() {
  int arr[26], c = 0;
  memset(arr, 0, sizeof(arr));
  string str;
  cin >> str;
  for (int i = 0; i < str.length(); i++) {
    if (arr[str[i] - 97] == 0) {
      arr[str[i] - 97] = 1;
      c++;
    }
  }
  cout << ((c % 2 == 0) ? "CHAT WITH HER!" : "IGNORE HIM!") << endl;
  return 0;
}
