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.

Ex Input:
Sentence: 'a hotdog with cheese with a side of chili fries'. Reverse all words of length '4' in the given sentence.

Ex Output:
a hotdog htiw cheese htiw a edis of chili fries


Ex Input:
Sentence: 'the couple are smiling at each other as they sit on a bench'. Reverse all words of length '4' in the given sentence.

Ex Output:
the couple are smiling at hcae other as yeht sit on a bench


Ex Input:
Sentence: 'this is the back of a silver phone'. Reverse all words of length '4' in the given sentence.

Ex Output:

siht is the kcab of a silver phone