Definition: 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.
Input: Sentence: 'close up of the neck and head of a giraffe looking into the camera with two close together trees just behind against clear blue sky'. Reverse all words of length '5' in the given sentence.

esolc up of the neck and head of a giraffe looking into the camera with two esolc together seert just behind against raelc blue sky