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538 B

nenokku

Instructions

You are given unknown amount of operations. There are 3 types of operations, you should handle each appropriately:

  1. "A word" - add the "word" into your "dictionary" of words.
  2. "? word" - check if the "word" is in your "dictionary".
  3. "x word" - end of operations.

Intersection of words is counted as if it is in your dictionary (see example). Write a program that takes as arguments operations.

$> ./main "? love" "? is" "A loveis" "? love" "? Who" "A Whoareyou" "? is"
NO
NO
YES
NO
YES