Bud gets a budget $2-$round Feistel system. It uses a $32-$bit $L,$ a $32-$bit $R,$ and a $32-$bit key $K.$ The function is $f(R,K)=Ro+K,$ with the same key for each round. Moreover, to avoid transmission errors, he always uses a $32-$bit message $M$ and lets $L_0=R_0=M.$ Eve does not know Bud's key, but she obtains the ciphertext for one of Bud's encryptions. Describe how Eve can obtain the plaintext $M$ and the key $K.$