import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    } main {
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        } true {
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        } String x = sc.next(); x sc.next() sc.next sc if(x.equals("0"))break; x.equals("0") x.equals x "0" break; int sum = 0 sum 0 i; i for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            } i = 0; i = 0 i 0 i < x.length() i x.length() x.length x i++ i++ i {
                sum = sum + x.charAt(i) - 48;
            } {
                sum = sum + x.charAt(i) - 48;
            } sum = sum + x.charAt(i) - 48 sum sum + x.charAt(i) - 48 sum + x.charAt(i) sum x.charAt(i) x.charAt x i 48 System.out.printf("%d\n",sum) System.out.printf System.out System System.out "%d\n" sum String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    }
} Main
import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        while(true){
            String x = sc.next();

            if(x.equals("0"))break;

            int sum = 0 ,i;

            for(i = 0;i < x.length();i++){
                sum = sum + x.charAt(i) - 48;
            }
            
            System.out.printf("%d\n",sum);
            
        }
    }
}
