#include <bits/stdc++.h>
int main() {
  int i, a[26], len, j, count = 1, k = 0, flag = 0;
  char s[101];
  scanf("%s", s);
  len = strlen(s);
  for (i = 0; i < len; i++) {
    count = 1;
    flag = 0;
    for (j = i + 1; j < len; j++) {
      if (s[i] == '0') {
        count = 0;
        break;
      }
      if (s[i] == s[j] && s[j] != '0') {
        count++;
        s[j] = '0';
      }
      flag = 1;
    }
    if ((count >= 1 && flag == 1) || (flag == 0 && s[i] != '0')) {
      a[k] = count;
      k++;
    }
  }
  if (k % 2 == 0) {
    printf("CHAT WITH HER!");
  } else {
    printf("IGNORE HIM!");
  }
  return 0;
}
