Definition: In this task, you need to reverse 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.
Input: Sentence: 'an erupting water pipe is drenching two workers while children watch'. Reverse all words of length '8' in the given sentence.

an gnitpure water pipe is drenching two workers while nerdlihc watch