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: 'there are many animals standing on the top of this mountain'. Reverse all words of length '4' in the given sentence.
there are ynam animals standing on the top of siht mountain

Sentence: 'a person parasails in water with mountains in the background'. Reverse all words of length '4' in the given sentence.
a person parasails in water htiw mountains in the background

Sentence: 'a woman using her headphones in a black and white photo'. Reverse all words of length '1' in the given sentence.

a woman using her headphones in a black and white photo