The number of distinct words in some text

Statement

Given a number \( n \), followed by \( n \) lines of text, print the number of distinct words that appear in the text.

For this, we define a word to be a sequence of non-whitespace characters, seperated by one or more whitespace or newline characters. Punctuation marks are part of a word, in this definition.

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In all the problems input the data using input() and print the result using print().