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 $S(A)$.

Sample Input 1

123 234

Sample Output 1

9

We have $S(123) = 1 + 2 + 3 = 6$ and $S(234) = 2 + 3 + 4 = 9$, so we should print the greater of these: $9$.

Sample Input 2

593 953

Sample Output 2

17

Sample Input 3

100 999

Sample Output 3

27