#include <bits/stdc++.h>
int main() {
  char s1[101];
  scanf("%s", s1);
  int len, i, a[27] = {0}, count = 0;
  len = strlen(s1);
  for (i = 0; i < len; i++) {
    a[s1[i] - 97]++;
  }
  for (i = 0; i < 27; i++) {
    if (a[i] == 1)
      count++;
    else if (a[i] > 1)
      count++;
  }
  if (count % 2 == 0)
    printf("CHAT WITH HER!\n");
  else
    printf("IGNORE HIM!\n");
  return 0;
}
