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 person on a surfboard in the water'. Remove all words of length '6' in the given sentence.
a on a surfboard in the water

Sentence: 'there are three men standing together by a pole in the street'. Remove all words of length '8' in the given sentence.
there are three men by a pole in the street

Sentence: 'a red white yellow and black train coming down a track'. Remove all words of length '4' in the given sentence.

a red white yellow and black train coming a track