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