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).

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).

Constraints

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

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

见题面 Input 部分

见题面 Output 部分