#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  string s1;
  cin >> s1;
  int len = s1.length();
  int i, j;
  int d = 0;
  for (i = 0; i < len; i++) {
    int count = 0;
    for (j = i + 1; j < len; j++) {
      if (s1[i] == s1[j]) count++;
    }
    if (count == 0) d++;
  }
  if (d % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
