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.

Sentence: 'a salt and pepper shaker near a plate with food'. Reverse all words of length '3' in the given sentence.
a salt dna pepper shaker near a plate with food

Sentence: 'four cute little ducklings swimming in the water'. Reverse all words of length '6' in the given sentence.
four cute elttil ducklings swimming in the water

Sentence: 'a man smiling for the camera at his desk'. Reverse all words of length '6' in the given sentence.

a man smiling for the aremac at his desk