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 AOJ.ITP
{
    public class SumOfNumbers
    {
        public static void Main()
        {
            while (true)
            {
                string input = Console.ReadLine();
                if (input == "0") { break; }

                int answer = 0;
                for (int i = 0; i < input.Length; i++)
                {
                    answer += int.Parse(input.Substring(i, 1));
                }

                Console.WriteLine(answer);
            }
        }
    }
}