Instructions: In this task, you need to remove 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: 'a man sleeping on couch with a blanket with a cat sleeping on top of him'. Remove all words of length '2' in the given sentence.
Output:
a man sleeping couch with a blanket with a cat sleeping top him