#include <bits/stdc++.h>
int main() {
  char str[100];
  int i, j, temp;
  scanf("%s", str);
  int l;
  l = strlen(str);
  for (i = 0; i < l - 1; i++) {
    for (j = i; j < l; j++) {
      if (str[i] > str[j]) {
        temp = str[i];
        str[i] = str[j];
        str[j] = temp;
      }
    }
  }
  int c = 0;
  for (i = 0; i < l; i++) {
    if (str[i] != str[i + 1]) c++;
  }
  if (c % 2 == 0)
    printf("CHAT WITH HER!\n");
  else
    printf("IGNORE HIM!\n");
  return 0;
}
