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.

Example Input: Sentence: 'a man is riding a motorcycle down the street'. Remove all words of length '3' in the given sentence.
Example Output: a is riding a motorcycle down street

Example Input: Sentence: 'a man riding a wave on top of a surfboard'. Remove all words of length '2' in the given sentence.
Example Output: a man riding a wave top a surfboard

Example Input: Sentence: 'a white and red train trees hills and fences'. Remove all words of length '6' in the given sentence.
Example Output:
a white and red train trees hills and