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: 'kite flying washington dc with smithsonian and washington monument in background'. Reverse all words of length '11' in the given sentence.

kite flying washington dc with nainoshtims and washington monument in background