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 that has their skis crossed in the air as they snow ski'. Reverse all words of length '4' in the given sentence.
a person taht has their siks crossed in the air as yeht wons ski

Sentence: 'the three trains are stopped on the railroad tracks'. Reverse all words of length '6' in the given sentence.
the three sniart are stopped on the railroad skcart

Sentence: 'several semi trucks and a blue bus with two people walking in a parking lot'. Reverse all words of length '6' in the given sentence.

several semi skcurt and a blue bus with two elpoep walking in a parking lot