import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while (true) {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			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 x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		}
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while (true) {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		while (true) {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while (true) {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		} true {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		} String x = sc.nextLine(); x sc.nextLine() sc.nextLine sc if(x.equals("0")) {
				break;
			} x.equals("0") x.equals x "0" {
				break;
			} break; int sum = 0; sum 0 String xary[] = x.split(""); xary x.split("") x.split x "" for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			} int i = 0; int i = 0; i 0 i < x.length() i x.length() x.length x i++ i++ i {
				sum += Integer.parseInt(xary[i]);
			} {
				sum += Integer.parseInt(xary[i]);
			} sum += Integer.parseInt(xary[i]) sum Integer.parseInt(xary[i]) Integer.parseInt Integer xary[i] xary i 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 x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		}
	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while (true) {
			String x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			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 x = sc.nextLine();
			if(x.equals("0")) {
				break;
			}
			int sum = 0;
			String xary[] = x.split("");
			for (int i = 0; i < x.length(); i++) {
				sum += Integer.parseInt(xary[i]);
			}
			System.out.println(sum);
		}
	}

}