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 _8_B
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string now = Console.ReadLine();
                if (now == "0")
                {
                    break;
                }
                int output = 0;
                for (int i = 0; i < now.Length; i++)
                {
                    int x = now[i] - '0';
                    output += x;
                }
                Console.WriteLine(output);
            }
            Console.ReadLine();
        }
    }
}