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.

Example input: Sentence: 'as a guy jumps over the snow with his snowboard people riding on the lift behind him look on'. Reverse all words of length '6' in the given sentence.
Example output: as a guy jumps over the snow with his snowboard elpoep gnidir on the lift dniheb him look on
Example explanation: Words 'people', 'riding', 'behind' are of length 6. Reversing these words results in 'elpoep', 'gnidir', and 'dniheb' respectively. So this is a correct answer.
Q: Sentence: 'an open area with numerous bags and moving trucks'. Reverse all words of length '4' in the given sentence.
A:
an nepo aera htiw numerous sgab and moving trucks