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;
using System.Collections.Generic;

class Program {
    static void Main() {
        string x;
        while((x = Console.ReadLine()) != "0") {
            int ans = 0;
            for(int i = 0; i < x.Length; i++) ans += int.Parse(x.Substring(i, 1));
            Console.WriteLine(ans);
        }
    }
}