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

