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 sum = 0;
	while (scan.hasNext()) {
	    int number = scan.nextInt();
	    if (number == 0) {
		break;
	    }
	    System.out.println(sum(number));
	}
    }
    public static int sum (int number) {
	int sum = 0;
	while (number > 0) {
	    sum += number % 10;
	    number /= 10;
	}
	return sum;
    }
}