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 street performer copying a woman on her phone'. Reverse all words of length '7' in the given sentence.
a street performer gniypoc a woman on her phone

Sentence: 'a person wearing skis turned around in the snow'. Reverse all words of length '1' in the given sentence.
a person wearing skis turned around in the snow

Sentence: 'a group of snow boarders pose in the snow on top of a hill'. Reverse all words of length '5' in the given sentence.

a puorg of snow boarders pose in the snow on top of a hill