Definition: 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.
Input: Sentence: 'a woman with an umbrella and a man in a bicycle helmet are standing next to a fence'. Remove all words of length '3' in the given sentence.

a woman with an umbrella a in a bicycle helmet standing next to a fence