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.

Ex Input:
Sentence: 'three people are sitting in the room playing video games'. Reverse all words of length '2' in the given sentence.

Ex Output:
three people are sitting ni the room playing video games


Ex Input:
Sentence: 'an old chair with telephone books on it in a room with guitars and a tv'. Reverse all words of length '7' in the given sentence.

Ex Output:
an old chair with telephone books on it in a room with sratiug and a tv


Ex Input:
Sentence: 'people are walking up the slopes of a snow covered mountain'. Reverse all words of length '4' in the given sentence.

Ex Output:

people are walking up the slopes of a wons covered mountain