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: 'a dog with a ball running along the edge of the ocean at the beach'. Reverse all words of length '5' in the given sentence.

a dog with a ball running gnola the edge of the naeco at the hcaeb