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 bus is stopped while three people are crossing'. Remove all words of length '1' in the given sentence.
Example Output: bus is stopped while three people are crossing

Example Input: Sentence: 'a group of people who are hiking up a snowy mountain'. Remove all words of length '5' in the given sentence.
Example Output: a of people who are hiking up a mountain

Example Input: Sentence: 'a man with cake on his face serves his friends'. Remove all words of length '4' in the given sentence.
Example Output:
a man on his serves his friends