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 man sits on the back of a pick up truck that is full of stuff'. Remove all words of length '3' in the given sentence.

a sits on back of a pick up truck that is full of stuff