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: 'two cows are lying down in a field'. Remove all words of length '4' in the given sentence.
Example Output: two are lying in a field

Example Input: Sentence: 'a pitcher releases the ball on the mound'. Remove all words of length '7' in the given sentence.
Example Output: a releases the ball on the mound

Example Input: Sentence: 'a couple of zebra standing on top of a lush green field'. Remove all words of length '6' in the given sentence.
Example Output:
a of zebra standing on top of a lush green field