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 grey cat with green eyes looking straight ahead'. Reverse all words of length '1' in the given sentence.

Ex Output:
a grey cat with green eyes looking straight ahead


Ex Input:
Sentence: 'a gentleman and child in a vintage picture with a horse'. Reverse all words of length '4' in the given sentence.

Ex Output:
a gentleman and child in a vintage picture htiw a horse


Ex Input:
Sentence: 'a couple of people operating a parking meter'. Reverse all words of length '6' in the given sentence.

Ex Output:

a elpuoc of elpoep operating a parking meter