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;

namespace ITP1_8_B
{
    class Program
    {
        static void Main(string[] args)
        {
            while(true)
            {
                string str = Console.ReadLine();
                int sum = 0;

                if (str == "0")
                    break;

                for (int i = 0; i < str.Length; i++ )
                {
                    sum += str[i] - '0';
                }

                Console.WriteLine("{0}", sum);
            }
        }
    }
}