Enter a $3 \times 3$ symmetric matrix $A$ that has entries $a_{11}=1$, $a_{22}=3$, $a_{33}=0$, $a_{1 2}=5$, $a_{3 1}=4$, and $a_{2 3}=2$.

$A =$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$