Elliptic Curves: Let E₅(1,2) be an elliptic curve defined over Z₅

E₅(1,2):

Assume two people A and B want to exchange a secret key using Elliptic Curve Diffie-Hellman Key Exchange (ECDH) method. The Elliptic Curve is E₅(1,2) and the generator G is (1,2). Given the two private keys n_A=3 and n_B=2, please calculate the public keys P_A and P_B and the secret key K.