#include <bits/stdc++.h>
int main() {
  char arr[200];
  char arr1[27] = "abcdefghijklmnopqrstuvwxyz";
  scanf("%s", &arr);
  int cont = 0;
  for (int i = 0; i < strlen(arr1); i++) {
    for (int j = 0; j < strlen(arr); j++) {
      if (arr1[i] == arr[j]) {
        cont++;
        break;
      } else {
      }
    }
  }
  if (cont % 2 == 0) {
    printf("CHAT WITH HER!");
  } else {
    printf("IGNORE HIM!");
  }
  return 0;
}
