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();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	}
}
 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();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	}
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
		while(true){
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	} main {
        Scanner sc = new Scanner(System.in);
		while(true){
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while(true){
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		} true {
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		} String x = sc.next(); x sc.next() sc.next sc int ans = 0; ans 0 if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			} x.equals("0") x.equals x "0" {
				break;
			} break; {
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			} for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				} int i=0; int i=0; i 0 i<x.length() i x.length() x.length x i++ i++ i {
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				} {
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				} ans += Integer.parseInt(String.valueOf(x.charAt(i))) ans Integer.parseInt(String.valueOf(x.charAt(i))) Integer.parseInt Integer String.valueOf(x.charAt(i)) String.valueOf String x.charAt(i) x.charAt x i System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
		while(true){
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	}
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
		while(true){
            String x = sc.next();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	}
} 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();
			int ans = 0;
			if(x.equals("0")){
				break;
			}else{
				for(int i=0; i<x.length(); i++){
					ans += Integer.parseInt(String.valueOf(x.charAt(i)));
				}
			}
			System.out.println(ans);
		}
	}
}

