#include <bits/stdc++.h>
using namespace std;
int main() {
  string ss;
  cin >> ss;
  int count[27] = {0};
  int ans = 0;
  for (int loop = 0; loop < ss.length(); loop++) {
    if (count[ss[loop] - 'a']) {
      ans--;
    }
    count[ss[loop] - 'a']++;
    ans++;
  }
  if (ans % 2 == 0) {
    cout << "CHAT WITH HER!\n";
  } else {
    cout << "IGNORE HIM!\n";
  }
}
