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: 'there is a stack of pancakes with syrup on a white plate'. Reverse all words of length '1' in the given sentence.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
there is a stack of pancakes with syrup on a white plate