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.

Let me give you an example: Sentence: 'as a guy jumps over the snow with his snowboard people riding on the lift behind him look on'. Reverse all words of length '6' in the given sentence.
The answer to this example can be: as a guy jumps over the snow with his snowboard elpoep gnidir on the lift dniheb him look on
Here is why: Words 'people', 'riding', 'behind' are of length 6. Reversing these words results in 'elpoep', 'gnidir', and 'dniheb' respectively. So this is a correct answer.

OK. solve this:
Sentence: 'some people are standing outside of a shop looking in the window'. Reverse all words of length '1' in the given sentence.
Answer:
some people are standing outside of a shop looking in the window