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: 'everything is covered with snow in the area the people are skiing in'. Reverse all words of length '4' in the given sentence.

everything is covered htiw wons in the aera the people are skiing in