#include <bits/stdc++.h>
using namespace std;
int main() {
  char s[100];
  int d = 0;
  map<int, int> MAP;
  fflush(stdin);
  gets(s);
  for (int i = 0; i < strlen(s); i++) {
    if (MAP[s[i]] == 0) d++;
    MAP[s[i]]++;
  }
  if (d % 2 == 0)
    cout << "CHAT WITH HER!" << endl;
  else
    cout << "IGNORE HIM!" << endl;
  return 0;
}
