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 scan = new Scanner(System.in);
        int n = scan.nextInt();
        while (n != 0){
            String number = Integer.toString(n);
            int sum = 0;
            for(int x = 0; x < number.length();x++) {
                sum = sum + Integer.parseInt(Character.toString(number.charAt(x)));
            }
            System.out.println(sum);
            n = scan.nextInt();
        }
    }
}