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 holding a remote and standing up'. Reverse all words of length '3' in the given sentence.
a nam holding a remote dna standing up

Sentence: 'a group of boys surfing in water'. Reverse all words of length '4' in the given sentence.
a group of syob surfing in water

Sentence: 'two bears walking in a river while fish swim underneath'. Reverse all words of length '1' in the given sentence.

two bears walking in a river while fish swim underneath