

import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		//
		while(true){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(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){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		}
	}
} Main public static void main(String[] args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		//
		while(true){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		}
	} main {
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		//
		while(true){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while(true){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		} true {
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		} long sum = 0; sum 0 String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc if(line.equals("0")){
				break;
				} line.equals("0") line.equals line "0" {
				break;
				} break; for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			} int i=0; int i=0; i 0 i<line.length() i line.length() line.length line i++ i++ i {
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			} {
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			} sum += Integer.parseInt(String.valueOf(line.charAt(i))) sum Integer.parseInt(String.valueOf(line.charAt(i))) Integer.parseInt Integer String.valueOf(line.charAt(i)) String.valueOf String line.charAt(i) line.charAt line 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){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		}
	}
} public class Main {
	public static void main(String[] args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		//
		while(true){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(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){
		//??£?¨??????????????????????
		long sum = 0;
		//1??????????????????
		String line = sc.nextLine();
		//?????£?????\???????????????1???
		
			//?????£?????\????????????1??????0?????£?????´????????????
			if(line.equals("0")){
				break;
				}
			
			//
			for(int i=0;i<line.length();i++){
				sum += Integer.parseInt(String.valueOf(line.charAt(i)));
			}
			//
			System.out.println(sum);
		}
	}
}