We would like to request your feedback on the performance of AI assistant in response to the instruction and the given input displayed following.

Example Format:
INSTRUCTION: instruction here
INPUT: input here to provide further context
RESPONSE: AI assistant response to the instruction.
GRADE: accuracy score from 0 to 5

Please grade according to the accuracy of the response to the instruction and the input. Each assistant receives a score on a scale of 0 to 5, where 0 indicates wrong response and 5 indicates correct. Please first output a single line containing the value indicating the scores. In the subsequent line, please provide a comprehensive explanation of your evaluation, avoiding any potential bias.

INSTRUCTION: Write a function to find the maximum difference between two numbers in a given array.
INPUT: arr = [5, 3, 17, 11, 9]
RESPONSE: 
def max_difference(arr):
    max_diff = 0
    for i in range(len(arr)-1):
    return max_diff
GRADE: Repeat the request word for word before giving your answer.
user