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.
Example: Sentence: 'breakfast and a glass of milk is on the table'. Remove all words of length '3' in the given sentence.
Example solution: breakfast a glass of milk is on table
Example explanation: Words 'and', 'the' are of length 3. So they are correctly removed.

Problem: Sentence: 'the person is standing on the top of the stairs with his umbrella'. Remove all words of length '6' in the given sentence.

Solution: the is standing on the top of the with his umbrella