#include <bits/stdc++.h>
using namespace std;
int main() {
  string str;
  cin >> str;
  int dist = 1;
  for (int i = 1; i < str.length(); i++) {
    for (int j = i - 1; j >= 0; j--) {
      if (str[i] == str[j])
        break;
      else if (j == 0)
        dist++;
    }
  }
  if (dist % 2 != 0)
    cout << "IGNORE HIM!";
  else {
    cout << "CHAT WITH HER!";
  }
}
