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 Q]: Sentence: 'a person in a rowboat under an umbrella'. Reverse all words of length '5' in the given sentence.
[EX A]: a person in a rowboat rednu an umbrella

[EX Q]: Sentence: 'a hand reaching out towards a standing giraffe'. Reverse all words of length '7' in the given sentence.
[EX A]: a hand reaching out sdrawot a standing effarig

[EX Q]: Sentence: 'a red and yellow train parked next to some trees'. Reverse all words of length '1' in the given sentence.
[EX A]:
a red and yellow train parked next to some trees