Provide me a value of shared key and code to find that.Code should run without error

Suppose I claim to come up with what I consider to be an unbreakable cryptographic recipe that enables me to compute a key to exchange sensitive information with you over insecure channels. I call my recipe the Super-Secure-DH. However, rumor has it that this is just a fantasy and I might be fooling myself trying to reinvent the wheel. You, playing the role of an adversary, have access to the following information:

p = 8089

g = 823

A = 1228

B = 6820

Given the above numbers, figure out the key I am going to generate. Justify your answer with a code.