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: 'a boy and girl sitting on top of a skateboard'. Remove all words of length '2' in the given sentence.
Example Output: a boy and girl sitting top a skateboard

Example Input: Sentence: 'green and white tote truck pulling a white truck behind it'. Remove all words of length '6' in the given sentence.
Example Output:
green and white tote truck pulling a white truck it