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 man stands wearing a suit and looking serious'. Remove all words of length '6' in the given sentence.
a man wearing a suit and looking serious

Sentence: 'a cow stretching its head over a fence to eat some leaves'. Remove all words of length '4' in the given sentence.
a cow stretching its a fence to eat leaves

Sentence: 'a city street at night with people crossing it'. Remove all words of length '8' in the given sentence.

a city street at night with people it