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 JAVA (judge verdict: Runtime Error)

import java.util.Scanner;

public class Main {
	public static void main(String[] args)
	{
		Scanner stdIn = new Scanner(System.in);
		
		while(true)
		{
			int x = stdIn.nextInt();
			int ans = 0;
			
			if(x == 0)
			{
				break;
			}
			
			while(true)
			{
				if(x==0)
				{
					break;
				}
				int k = x % 10;
				x = x/10;
				ans += k;
			}
			System.out.println(ans);
		}
	}
}