#include <bits/stdc++.h>
using namespace std;
int main() {
  string t;
  getline(cin, t);
  int arr[26] = {0};
  int c = 0, i;
  for (i = 0; i < t.size(); i++) {
    arr[t[i] - 'a']++;
  }
  for (i = 0; i < 26; i++) {
    if (arr[i] != 0) c = c + 1;
  }
  if (c % 2 != 0)
    cout << "IGNORE HIM!" << endl;
  else
    cout << "CHAT WITH HER!" << endl;
  return 0;
}
