#include <bits/stdc++.h>
int main() {
  char array[102];
  scanf("%s", array);
  int i = 0;
  int j = 0;
  int lenght = 0;
  while (array[lenght] != '\0') lenght++;
  int len = lenght;
  for (i = 0; i < lenght; i++) {
    for (j = i + 1; j < lenght; j++) {
      if (array[i] == array[j]) {
        len--;
        break;
      }
    }
  }
  if (len % 2 == 0)
    printf("CHAT WITH HER!\n");
  else
    printf("IGNORE HIM!\n");
  return 0;
}
