Consider the set of all integers $S = {x \in \mathbb{Z} : 10 \le x \le 99}$. Let $A$ be the sum of all elements in $S$ that are congruent to $3 \pmod 7$, and let $B$ be the sum of all elements in $S$ that are congruent to $5 \pmod 9$. What is the value of $A + B$?