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 toddler standing next to a sheep pen'. Remove all words of length '4' in the given sentence.
Example Output: a toddler standing to a sheep pen

Example Input: Sentence: 'the puppy and kitten are in a field of grass'. Remove all words of length '5' in the given sentence.
Example Output: the and kitten are in a of

Example Input: Sentence: 'a man is laying naked in his bed reading a book'. Remove all words of length '6' in the given sentence.
Example Output:
a man is naked in his bed reading a book