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: 'one person stands on top of a car while two people stand next to the car looking up at the person'. Remove all words of length '7' in the given sentence.

one person stands on top of a car while two people stand next to the car up at the person