#include <bits/stdc++.h>
using namespace std;
long long arr[100009], pr[100009];
unsigned long long n, m, a;
int main() {
  std::ios_base::sync_with_stdio(NULL);
  cin.tie(NULL);
  cout.tie(NULL);
  string s;
  int x = 0, k = 0;
  cin >> s;
  int l = 0;
  sort(s.begin(), s.end());
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == s[i - 1]) {
      s.erase(i, 1);
      i--;
    }
  }
  x = s.length();
  if (x % 2 == 0)
    cout << "CHAT WITH HER!" << endl;
  else
    cout << "IGNORE HIM!" << endl;
}
