Problem Statement

For an integer $n$, let $S(n)$ be the sum of digits in the decimal notation of $n$. For example, we have $S(123) = 1 + 2 + 3 = 6$.

Given two $3$-digit integers $A$ and $B$, find the greater of $S(A)$ and $S(B)$.

Constraints

• All values in input are integers.
• $100 \le A, B \le 999$

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value of the greater of $S(A)$ and $S(B)$. If these are equal, print $S(A)$.