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;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var s = "";
            while (true)
            {
                s = Console.ReadLine();

                if (s == "0") break;

                var answer = 0L;
                foreach (var c in s)
                {
                    answer += int.Parse(c.ToString());
                }

                Console.WriteLine(answer);
            }
        }
    }
}