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: 'an assortment of chinese dinner options are arranged'. Reverse all words of length '8' in the given sentence.
an assortment of chinese dinner options are degnarra

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: 'a surfer uses an oar to steer his board'. Reverse all words of length '3' in the given sentence.

a surfer uses an rao to steer sih board