Alice and Bob are using the ElGamal cipher with the parameters p$=37$

and $\backslash$alpha $=2$

$.$

Their parameters are small and we decide to crack the cipher.

Suppose Alice is observed sending public ephemeral key kE$=7$

and Bob sends public key $\backslash$beta $=24$

$.$

Alice is observed transmitting the ciphertext y$=16$

$.$

a$)$ What is the masking key kM$?$

b$)$ What is the plaintext?