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: 'pepperoni and black olive pizza slice on a blue plate with flowers on top of a vegan cookbook with grass in background'. Remove all words of length '5' in the given sentence.

pepperoni and on a blue with flowers on top of a cookbook with in background