#include <bits/stdc++.h>
using namespace std;
bool ch['z' + 1] = {0};
string res[2] = {"CHAT WITH HER!", "IGNORE HIM!"};
int main() {
  string str;
  cin >> str;
  int t = 0;
  for (int i = 0; i < str.size(); i++) {
    if (!ch[str[i]]) {
      t++;
      ch[str[i]] = true;
    }
  }
  cout << res[t % 2] << endl;
  return 0;
}
