#include <bits/stdc++.h>
void solve(char *str) {
  char letters[101] = {0};
  int i = 0;
  for (char *ptr = str; *ptr; ++ptr) {
    if (!strchr(letters, *ptr)) letters[i++] = *ptr;
  }
  letters[i] = '\0';
  int letters_len = strlen(letters);
  if (letters_len & 1)
    puts("IGNORE HIM!");
  else
    puts("CHAT WITH HER!");
}
int main(void) {
  char input[101];
  scanf("%100s", input);
  solve(input);
  return 0;
}
