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 dog that is laying down on a blanket'. Remove all words of length '4' in the given sentence.
Example Output: a dog is laying on a blanket

Example Input: Sentence: 'a woman eats a piece of food with her hands'. Remove all words of length '4' in the given sentence.
Example Output: a woman a piece of her hands

Example Input: Sentence: 'a herd of cows on the beach by a sign'. Remove all words of length '4' in the given sentence.
Example Output:
a of on the beach by a