Question: You are learning a new language, and are having a competition to see how many unique words you know in it to test your vocabulary

You are learning a new language, and are having a competition to see how many unique words you know in it to test your vocabulary learning.

Write a program where you can enter one word at a time, and be told how many unique words you have entered. You should not count duplicates. The program should stop asking for more words when you enter a blank line.

For example:

 
Word: Chat
Word: Chien
Word: Chat
Word: Escargot
Word: 
You know 3 unique word(s)

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