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: 'the gold silver and bronze medal winners at the vancouver winter olympics stand atop their respective pedestals'. Reverse all words of length '5' in the given sentence.

the gold silver and bronze ladem winners at the vancouver winter olympics dnats atop rieht respective pedestals