URGENT PLEASE!

Please show all steps and explain.

In the ELGamal probabilistic public-key cryptosystem with p=179, Bob uses the smallest generator g for Z179 with a public mask of B=77. Compute the values of g and the secret exponent A. Bob receives a ciphertext from Alice containing the sequence H=77,C=143 where H is the half-mask (hint for the full-mask F) and C is the randomly masked message (CMF(modp)). Circle in the ASCII table the plaintext character M that Alice send to Bob