#include <bits/stdc++.h>
using namespace std;
int main() {
  string name1;
  getline(cin, name1);
  string name2 = "";
  int c = 0;
  for (int i = 0; i < name1.size(); i++) {
    if (name2.find(name1[i]) == name1.npos) {
      name2 += name1[i];
      ++c;
    }
  }
  if (c % 2 == 0)
    cout << "CHAT WITH HER!" << endl;
  else
    cout << "IGNORE HIM!" << endl;
  return 0;
}
