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 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: 'a small child with a helmet is on skis'. Remove all words of length '2' in the given sentence.
Example Output: a small child with a helmet skis

Example Input: Sentence: 'a happy young man riding a boogie board on a wave'. Remove all words of length '6' in the given sentence.
Example Output:
a happy young man a board on a wave