import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    }
} Main public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    } main {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int cnt = 0; cnt 0 while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        } true {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        } String str = br.readLine(); str br.readLine() br.readLine br if (str.equals("0")) {
                break;
            } str.equals("0") str.equals str "0" {
                break;
            } break; for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            } int i = 0; int i = 0; i 0 i < str.length() i str.length() str.length str i++ i++ i {
                cnt += Character.getNumericValue(str.charAt(i));
            } {
                cnt += Character.getNumericValue(str.charAt(i));
            } cnt += Character.getNumericValue(str.charAt(i)) cnt Character.getNumericValue(str.charAt(i)) Character.getNumericValue Character str.charAt(i) str.charAt str i System.out.println(cnt) System.out.println System.out System System.out cnt cnt = 0 cnt 0 String[] args args public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    }
} public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cnt = 0;
        while (true) {
            String str = br.readLine();
            if (str.equals("0")) {
                break;
            }
            for (int i = 0; i < str.length(); i++) {
                cnt += Character.getNumericValue(str.charAt(i));
            }
            System.out.println(cnt);
            cnt = 0;
        }
    }
}