Problem:
Sum of Numbers

Write a program which reads an integer and prints sum of its digits.

Input

The input consists of multiple datasets. For each dataset, an integer x is given in a line. The number of digits in x does not exceed 1000.

The input ends with a line including single zero. Your program should not process for this terminal symbol.

Output

For each dataset, print the sum of digits in x.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in C# (judge verdict: Accepted)

using System;
using System.Linq;

class Program {

    private static int Main() {
        while( true ) {
            var input = Console.ReadLine();
            var sum = input.Select( _ => int.Parse( _.ToString() ) ).Sum();

            if( sum != 0 ) {
                Console.WriteLine( sum );
            } else {
                break;
            }
        }


        return 0;
    }

}