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;

class ITP1
{
    static void Main()
    {
        int a;
        while (true)
        {
            var str = Console.ReadLine().ToCharArray();
            if (str[0] == '0')
            {
                break;
            }
            a = 0;
            for (int i = 0; i < str.Length; i++)
            {
                a += int.Parse(str[i].ToString());
            }
            Console.WriteLine(a);
        }
    }
}