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;

namespace Aizu
{
    class OnlineJudge
    {
        public static void Main()
        {
            for(string input; (input = Console.ReadLine()) != "0" ; Console.WriteLine(input.ToCharArray().Select(p => p - '0').Sum()));
        }
    }
}