#include <bits/stdc++.h>
using namespace std;
int a[27];
int main() {
  string s = "";
  cin >> s;
  for (int i = 0; i < s.length(); i++) {
    a[s[i] - 97]++;
  }
  int ans = 0;
  for (int i = 0; i < 27; i++) {
    if (a[i] > 0) {
      ans++;
    }
  }
  if (ans % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
  return 0;
}
