Are there any equal words in the input?
If there are, are they counted as one word or several words?

• read the problem carefully (107) hawk 2005-04-23 22:32:37
  • Re:read the problem carefully (150) T15 2005-04-23 22:50:23
    • Sort the member words lexicographically and print equal words only once. (156) hawk 2005-04-23 22:53:00