#include <bits/stdc++.h>
using namespace std;
bool a[257];
int ans = 0;
char s;
int main() {
  while (cin >> s) {
    if (s != ' ' && s != '\n') a[s] = 1;
  }
  for (int i = 0; i < 257; i++)
    if (a[i] == 1) ans++;
  if (ans % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
  return 0;
}
