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 european army helicopter flying in the sky'. Remove all words of length '8' in the given sentence.

A: a army helicopter flying in the sky
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Q: Sentence: 'a number of benches at the beach and a boat in the sea'. Remove all words of length '7' in the given sentence.

A: a number of at the beach and a boat in the sea
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Q: Sentence: 'a ambulance and a fire truck on a highway'. Remove all words of length '2' in the given sentence.

A:
a ambulance and a fire truck a highway
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