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.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int n,sum;
    while ((n = sc.nextInt()) != 0){
      String s = String.valueOf(n);
      sum = 0;
      for(int i = 0;i < s.length();i++){
        sum += Integer.parseInt(String.valueOf(s.charAt(i)));
      }
      System.out.println(sum);
    }
  }
}