#include <bits/stdc++.h>
using namespace std;
int main() {
  string re;
  cin >> re;
  int seen[26] = {0};
  int dif = 0;
  for (auto va : re) {
    if (!seen[va - 'a']) ++dif, seen[va - 'a'] = 1;
  }
  if (dif & 1)
    puts("IGNORE HIM!");
  else
    puts("CHAT WITH HER!");
  return 0;
}
