#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  string name;
  cin >> name;
  int l[26] = {0};
  int ans = 0;
  for (char c : name) {
    l[c - 'a']++;
  }
  for (int x = 0; x < 26; x++) {
    if (l[x] != 0) {
      ans++;
    }
  }
  if (ans % 2 == 0) {
    cout << "CHAT WITH HER!" << '\n';
  } else {
    cout << "IGNORE HIM!" << '\n';
  }
  return 0;
}
