You will be given a definition of a task first, then some input of the task.
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 close up of a bowl of food next to an apple'. Reverse all words of length '1' in the given sentence.
Output:
a close up of a bowl of food next to an apple