#include <bits/stdc++.h>
using namespace std;
string str;
bool a[300];
long long ans;
int main() {
  cin >> str;
  for (int i = 0; i < str.size(); i++) {
    a[str[i]] = true;
  }
  for (int i = 'a'; i <= 'z'; i++) {
    if (a[i] == true) ans++;
  }
  if (ans % 2 == 1)
    cout << "IGNORE HIM!";
  else
    cout << "CHAT WITH HER!";
  return 0;
}
