7. Let $M \Theta N$ denote the remainder of the division of the larger number by the smaller number among $M$ and $N$. For example, $3 \Theta 10=1$. For a non-zero natural number $A$ less than 40, given that $20 \Theta(A \bigodot 20)=7$, then $A=$ $\qquad$
7. 【Answer】 33