In this task, you need to remove all words of a given length in the sentence. The number of letters in a word determine its length, for example, the length of the word "apple" is 5.

Q: Sentence: 'a large airplane flies in blue skies over some pretty trees'. Remove all words of length '6' in the given sentence.

A: a large airplane flies in blue skies over some trees
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Q: Sentence: 'a old building that has a big clock on top'. Remove all words of length '4' in the given sentence.

A: a old building has a big clock on top
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Q: Sentence: 'a baseball player after he threw the ball'. Remove all words of length '2' in the given sentence.

A:
a baseball player after threw the ball
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