#include <bits/stdc++.h>
using namespace std;
int main() {
  int x;
  string s;
  char arr[100];
  set<char> myset;
  cin >> arr;
  int l = strlen(arr);
  for (int i = 0; i < l; i++) {
    myset.insert(arr[i]);
  }
  if (myset.size() % 2 != 0)
    cout << "IGNORE HIM!" << endl;
  else
    cout << "CHAT WITH HER!" << endl;
  return 0;
}
