Description

Nick and Glaire love playing the "Sum Game". The rules are: one person says a number, and the other person must say the sum of its digits. For example, if Nick says 12, Glaire says 3; if Nick says 567, Glaire says 18.
Write a program that takes an integer as input and outputs the sum of its digits.

Input Format

Input an integer.

Output Format

Output the sum of its digits.

Sample

1234

10