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: 'a parent bird feeding one of the baby birds while other babies look on'. Reverse all words of length '5' in the given sentence.

a parent bird feeding one of the baby sdrib elihw rehto babies look on