import java.util.Scanner;

public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(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 line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    }
} Main public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    } main {
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        } true {
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        } String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc int sum = 0; sum 0 if(line.charAt(0) == '0')break; line.charAt(0) == '0' line.charAt(0) line.charAt line 0 '0' break; for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            } int i = 0; int i = 0; i 0 i < line.length() i line.length() line.length line i++ i++ i {
                sum += Character.digit(line.charAt(i), 10);
            } {
                sum += Character.digit(line.charAt(i), 10);
            } sum += Character.digit(line.charAt(i), 10) sum Character.digit(line.charAt(i), 10) Character.digit Character line.charAt(i) line.charAt line i 10 System.out.println(sum) System.out.println System.out System System.out sum String [] args args public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    }
} public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        
        while(true){
            String line = sc.nextLine();
            int sum = 0;
            
            if(line.charAt(0) == '0')break;
            
            for(int i = 0; i < line.length(); i++){
                sum += Character.digit(line.charAt(i), 10);
            }
            System.out.println(sum);
        }
    }
}
