Definition: 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 building with a clock on the outside of it and a compass on top of it'. Remove all words of length '7' in the given sentence.

a building with a clock on the of it and a on top of it