#include <bits/stdc++.h>
using namespace std;
const long long A = 100000000000000LL, N = 10000;
string a;
long long o, i, j, n, b[26], m;
int main() {
  cin >> a;
  n = a.size();
  for (i = 0; i < n; i++) b[a[i] - 'a'] = 1;
  for (i = 0; i < 26; i++) o += b[i];
  if (o % 2)
    cout << "IGNORE HIM!";
  else
    cout << "CHAT WITH HER!";
}
