#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  vector<int> abc(26);
  for (auto &a : abc) a = 0;
  for (auto letter : s) abc[int(letter - 'a')]++;
  int count = 0;
  for (auto a : abc)
    if (a != 0) count++;
  if (count % 2 == 1)
    cout << "IGNORE HIM!";
  else
    cout << "CHAT WITH HER!";
}
