#include <bits/stdc++.h>
int main() {
  int atz[26] = {0}, i, cnt = 0;
  char str[100];
  scanf("%s", str);
  for (i = 0; i < strlen(str); i++) atz[str[i] - 97]++;
  for (i = 0; i < 26; i++)
    if (atz[i] != 0) cnt++;
  if (cnt % 2 == 0)
    printf("CHAT WITH HER!");
  else
    printf("IGNORE HIM!");
  return 0;
}
