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.

Example Input: Sentence: 'competitor preparing to return volley during major tennis tournament'. Reverse all words of length '6' in the given sentence.
Example Output: competitor preparing to nruter yellov gnirud major sinnet tournament

Example Input: Sentence: 'a group of snow boarders pose in the snow on top of a hill'. Reverse all words of length '5' in the given sentence.
Example Output: a puorg of snow boarders pose in the snow on top of a hill

Example Input: Sentence: 'several people are standing at a yellow food truck'. Reverse all words of length '7' in the given sentence.
Example Output:
lareves people are standing at a yellow food truck