#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:64000000")
const int maxn = 1 << 17;
const int inf = 1000000007;
const int mod = 1000000007;
int main() {
  string s;
  set<char> a;
  cin >> s;
  for (int i = 0; i < s.length(); i++) a.insert(s[i]);
  cout << (a.size() & 1 ? "IGNORE HIM!" : "CHAT WITH HER!") << endl;
  return 0;
}
