A+B Coming

Many classmates said to me that A+B is must needs.
If you can’t AC this problem, you would invite me for night meal. ^_^

Input may contain multiple test cases. Each case contains A and B in one line.
A, B are hexadecimal number.
Input terminates by EOF.

Output A+B in decimal number in one line.

1 9
A B
a b

10
21
21

威士忌

HZIEE 2007 Programming Contest