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 couple walking in the rain using and umbrella'. Reverse all words of length '6' in the given sentence.

Ex Output:
a elpuoc walking in the rain using and umbrella


Ex Input:
Sentence: 'a man watches two giraffes eating from a box'. Reverse all words of length '4' in the given sentence.

Ex Output:
a man watches two giraffes eating morf a box


Ex Input:
Sentence: 'the street sign is posted beneath the light of a lamp post'. Reverse all words of length '3' in the given sentence.

Ex Output:

eht street sign is posted beneath eht light of a lamp post