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 fire hydrant with an out of service sign and a dog in the background'. Remove all words of length '4' in the given sentence.
a hydrant an out of service and a dog in the background

Sentence: 'a motorcycle covered with a red blanket is parked in the middle of a plaza'. Remove all words of length '3' in the given sentence.
a motorcycle covered with a blanket is parked in middle of a plaza

Sentence: 'a ski lift giving people a lift to the slopes'. Remove all words of length '4' in the given sentence.

a ski giving people a to the slopes