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.

Sentence: 'a black youth rides his skateboard over a footbridge'. Remove all words of length '4' in the given sentence.
a black youth rides his skateboard a footbridge

Sentence: 'a boy looks excitedly at his birthday cake with his friend'. Remove all words of length '9' in the given sentence.
a boy looks at his birthday cake with his friend

Sentence: 'a large red bus with two levels is going past buildings'. Remove all words of length '6' in the given sentence.

a large red bus with two is going past buildings