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 man in a blue shirt is playing tennis'. Reverse all words of length '3' in the given sentence.
a nam in a blue shirt is playing tennis

Sentence: 'a very small shiny metal cup with some food in it'. Reverse all words of length '4' in the given sentence.
a yrev small shiny metal cup htiw emos doof in it

Sentence: 'blue and white toothbrush in focus in front of a man'. Reverse all words of length '1' in the given sentence.

blue and white toothbrush in focus in front of a man