#include <bits/stdc++.h>
using namespace std;
int main() {
  char a[100];
  cin >> a;
  int n;
  n = strlen(a);
  for (int i = 0; i < n; i++) {
    for (int j = i + 1; j < n;) {
      if (a[j] == a[i]) {
        for (int k = j; k < strlen(a); k++) {
          a[k] = a[k + 1];
        }
        n--;
      } else {
        j++;
      }
    }
  }
  if (strlen(a) % 2 == 0) {
    cout << "CHAT WITH HER!";
  } else {
    cout << "IGNORE HIM!";
  }
}
