Detailed Instructions: 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.
Q: Sentence: 'a paddle surfer poking at another surfer with his paddle  while riding a wave'. Reverse all words of length '6' in the given sentence.
A:
a elddap refrus gnikop at another refrus with his elddap while gnidir a wave