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