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 fire hydrant sits off a city street'. Remove all words of length '4' in the given sentence.
a hydrant off a street

Sentence: 'a family of ducks floating across a lake'. Remove all words of length '2' in the given sentence.

a family ducks floating across a lake