Suppose $\mathrm{A}$ and $\mathrm{B}$ use Diffie-Hellnian key exchange. Let the commonly agreed (i.e., global public) prime number $(q)=13$ and the primitive root $(\alpha)=6$. If $\text{A}$ chose the private value $\left(X_{A}\right)=5$ and $\text{B}$ chose the private value $\left(X_{B}\right)=4$. Find the shared secret key $(\mathrm{K})$ between $\mathrm{A}$ and $\mathrm{B}$