#include <bits/stdc++.h>
using namespace std;
int main() {
  string name;
  cin >> name;
  vector<int> v;
  for (int i = 0; i < 26; i++) {
    v.push_back(0);
  }
  for (int i = 0; i < name.length(); i++) {
    v[name[i] - 'a'] = 1;
  }
  int c = 0;
  for (int i = 0; i < 26; i++) {
    if (v[i] == 1) c++;
  }
  if (c % 2 == 1)
    cout << "IGNORE HIM!";
  else
    cout << "CHAT WITH HER!";
  return 0;
}
