#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
const long long INF = 1e18;
const long long nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0};
void IO() {}
int32_t main() {
  IO();
  string s;
  cin >> s;
  long long l = s.length();
  set<char> w;
  w.insert(s[0]);
  long long n = 1;
  for (long long i = 1; i < l; i++) {
    if (!(w.count(s[i]))) {
      w.insert(s[i]);
      n++;
    }
  }
  if (n % 2 != 0)
    cout << "IGNORE HIM!"
         << "\n";
  else
    cout << "CHAT WITH HER!"
         << "\n";
  return 0;
}
