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: 'boats sailing along a river next to a cliff with buildings on it'. Remove all words of length '4' in the given sentence.
boats sailing along a river to a cliff buildings on it

Sentence: 'four pizzas sitting on a counter in a kitchen'. Remove all words of length '4' in the given sentence.
pizzas sitting on a counter in a kitchen

Sentence: 'a keeper feeding a baby elephant with a milk bottle'. Remove all words of length '1' in the given sentence.

keeper feeding baby elephant with milk bottle