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 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: 'the lady is taking a picture while holding water'. Remove all words of length '4' in the given sentence.
the is taking a picture while holding water

Sentence: 'a boat cuts through the water with trees and a lighthouse in the background'. Remove all words of length '3' in the given sentence.

a boat cuts through water with trees a lighthouse in background