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.Text;

namespace ITP1_8_B
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder();
            while (true)
            {
                string x = Console.ReadLine();
                if (x == "0")
                    break;
                int sum = 0;
                foreach (var n in x)
                {
                    sum += int.Parse(n.ToString());
                }
                sb.AppendLine(sum.ToString());
            }
            Console.Write(sb);
        }
    }
}