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.io.*;

public class Main {
	public static void main(String[] args)throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder data = new StringBuilder();
		 
        while(true){
    		int sum = 0;                   //sum??????????????????????????????????¨??????¨???.???????????????????????¨?????????????????????????¨????
            String str = br.readLine();    
            int strsize = str.length();    //strsize?????????????????????????????¨???
            int x = Integer.parseInt(str); //x ?????\??????????????´??°???
                if(x == 0) break;
                
     //??°?????????????????????????????????????????????       
                for(int i = 0; i < strsize; i++){
                    sum += Integer.parseInt(String.valueOf(str.charAt(i))); //????????§????????????????????¨???????????????????????????
                    
                }
                data.append(sum).append("\n"); //?????£??????????????????????????????????????????????????????????????????????????????????????£??????????????????????????????
        } //while?????????
        
     //??????????????????  
        System.out.print(data);

	}
}