#include <bits/stdc++.h>
using namespace std;
int nodistinct(string s, string a) {
  int counter = 0;
  for (int i = 0; i < a.size(); i++) {
    for (int j = 0; j < s.size(); j++) {
      if (a[i] == s[j]) {
        counter++;
        break;
      }
    }
  }
  return counter;
}
int main() {
  string alpha = "abcdefghijklmnopqrstuvwxyz";
  string s;
  cin >> s;
  if (nodistinct(s, alpha) % 2 != 0) {
    cout << "IGNORE HIM!";
  } else
    cout << "CHAT WITH HER!";
}
