#include <bits/stdc++.h>
char distinct[105];
int main() {
  int len, i, k = 0;
  char name[101];
  gets(name);
  len = strlen(name);
  for (i = 0; i < len; i++) {
    if (distinct[name[i]] == 0) {
      distinct[name[i]] = 1;
      k++;
    }
  }
  if (k % 2 == 0)
    printf("CHAT WITH HER!\n");
  else
    printf("IGNORE HIM!\n");
  return 0;
}
