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 with a backpack waiting at a train station'. Remove all words of length '7' in the given sentence.
a man with a backpack at a train

Sentence: 'a woman relaxing feet up on a bench'. Remove all words of length '4' in the given sentence.
a woman relaxing up on a bench

Sentence: 'six people with a dog in the snow'. Remove all words of length '6' in the given sentence.

six with a dog in the snow