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 set of grayish green metal park benches one of which is damaged'. Remove all words of length '1' in the given sentence.

set of grayish green metal park benches one of which is damaged