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: 'an otherwise ordinary roof and chimney are offset by an ornate tower resting in the middle of the roof that features ornamental work a walkway a weather vane and a clock'. Remove all words of length '8' in the given sentence.

an otherwise roof and chimney are offset by an ornate tower resting in the middle of the roof that ornamental work a walkway a weather vane and a clock