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 surfer is leaving the water with his board as the waves roll in'. Remove all words of length '4' in the given sentence.
Example Output: a surfer is leaving the water his board as the waves in

Example Input: Sentence: 'a red and white jet on a runway and brown grass'. Remove all words of length '6' in the given sentence.
Example Output: a red and white jet on a and brown grass

Example Input: Sentence: 'ducks standing and swimming in a pond'. Remove all words of length '4' in the given sentence.
Example Output:
ducks standing and swimming in a