#include <bits/stdc++.h>
using namespace std;
int main() {
  int w = 26;
  int count = 0;
  char a[] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
              'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
  string b;
  cin >> b;
  for (char c : b) {
    for (int m = 0; m < w; m++) {
      if (c == a[m]) {
        a[m] = '1';
        count++;
      }
    }
  }
  if (count % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
  return 0;
}
