#include <bits/stdc++.h>
using namespace std;
int main() {
  char name[101];
  int i, j, count = 0;
  cin >> name;
  for (i = 0; name[i] != '\0'; i++) {
    if (name[i] != '1') {
      for (j = i + 1; name[j] != '\0'; j++)
        if (name[j] == name[i]) name[j] = '1';
    }
  }
  for (i = 0; name[i] != '\0'; i++)
    if (name[i] != '1') count++;
  if (count % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
