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.*;
 
class Main{
    public static void main(String[] args){
		int sum;
		Scanner scan = new Scanner(System.in);
		
		while(true){
			sum = 0;
			int num = scan.nextInt();
			if(num == 0){
				break;
			}
			while(num >= 1){
				sum += num % 10;
				num = num / 10;
			}
			System.out.println(sum);
		}
    }
}