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