import java.util.Scanner;

public class Main {
    public static void main(String... args) {
        Scanner sc = new Scanner(System.in);

        while(true) {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	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 str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        }
    }
} Main public static void main(String... args) {
        Scanner sc = new Scanner(System.in);

        while(true) {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        }
    } main {
        Scanner sc = new Scanner(System.in);

        while(true) {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while(true) {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        } true {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        } String str = sc.next(); str sc.next() sc.next sc int sum = 0; sum 0 if(str.equals("0")) {
        		break;
        	} str.equals("0") str.equals str "0" {
        		break;
        	} break; for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	} int i = 0; int i = 0; i 0 i < str.length() i str.length() str.length str i++ i++ i {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	} {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	} sum += Integer.parseInt(str.substring(i, i+1)) sum Integer.parseInt(str.substring(i, i+1)) Integer.parseInt Integer str.substring(i, i+1) str.substring str i i+1 i 1 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 str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        }
    }
} public class Main {
    public static void main(String... args) {
        Scanner sc = new Scanner(System.in);

        while(true) {
        	String str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	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 str = sc.next();
        	int sum = 0;

        	if(str.equals("0")) {
        		break;
        	}

        	for(int i = 0; i < str.length(); i++) {
        		sum += Integer.parseInt(str.substring(i, i+1));
        	}

        	System.out.println(sum);
        }
    }
}
