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