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 person in bear feet standing on a skateboard'. Reverse all words of length '4' in the given sentence.
a person in raeb teef standing on a skateboard

Sentence: 'a vintage photo of a man riding an old motorcycle'. Reverse all words of length '7' in the given sentence.
a egatniv photo of a man riding an old motorcycle

Sentence: 'two horses with are walking on the mountain while carrying items'. Reverse all words of length '7' in the given sentence.

two horses with are gniklaw on the mountain while carrying items