import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    } main {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        } true {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        } String x = scan.nextLine(); x scan.nextLine() scan.nextLine scan if (x.equals("0")) break; x.equals("0") x.equals x "0" break; int sum = 0; sum 0 for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            } int i = 0; int i = 0; i 0 i < x.length() i x.length() x.length x i++ i++ i {
                sum += x.charAt(i) - '0';
            } {
                sum += x.charAt(i) - '0';
            } sum += x.charAt(i) - '0' sum x.charAt(i) - '0' x.charAt(i) x.charAt x i '0' 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 scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (true) {
        String x = scan.nextLine();
            if (x.equals("0")) break;
            int sum = 0;
            for (int i = 0; i < x.length(); i++) {
                sum += x.charAt(i) - '0';
            }
            System.out.println(sum);
        }
    }
}