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.

Example

Input

123
55
1000
0


Output

6
10
1
import java.util.*;
//import java.lang.Math;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        while(true){
            String S=sc.next();
            int n=S.length();
            int ans=0;
            if(n==1 && S.charAt(0)=='0') break;
            for(int i=0;i<n;i++) ans+=(S.charAt(i)-'0');
            System.out.println(ans);
        }
        sc.close();
    }
}
