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.

[Q]: Sentence: 'a man assisting a person on a horse on a race track'. Reverse all words of length '3' in the given sentence.
[A]: a nam assisting a person on a horse on a race track


[Q]: Sentence: 'a shirtless man lays on a bed and smiles'. Reverse all words of length '9' in the given sentence.
[A]: a sseltrihs man lays on a bed and smiles


[Q]: Sentence: 'a little girl is holding a minnie mouse umbrella above her head'. Reverse all words of length '5' in the given sentence.
[A]:
a little girl is holding a minnie esuom umbrella evoba her head