#include <bits/stdc++.h>
int main() {
  int i, a[100], j, count = 0;
  char ch[300];
  gets(ch);
  for (j = 0; j < 26; j++) a[j] = 0;
  for (i = 0; i < (strlen(ch)); i++) {
    a[ch[i] - 'a'] += 1;
    if (a[ch[i] - 'a'] == 1) {
      count++;
    } else
      continue;
  }
  if (count % 2 == 0)
    printf("CHAT WITH HER!");
  else
    printf("IGNORE HIM!");
  return 0;
}
