import java.util.*;

public class Main {
    public static void main(String[] args){
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}}}

 import java.util.*; util.* java public class Main {
    public static void main(String[] args){
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}}} Main public static void main(String[] args){
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}} main {
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}} Scanner sc= new Scanner(System.in); sc new Scanner(System.in) while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
} true {
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
} String a= sc.next(); a sc.next() sc.next sc if(a.equals("0")) 
         break; a.equals("0") a.equals a "0" break; int sum= 0; sum 0 for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } int i= 0; int i= 0; i 0 i<a.length() i a.length() a.length a i++ i++ i { 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } { 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } sum+= Character.getNumericValue(a.charAt(i)) sum Character.getNumericValue(a.charAt(i)) Character.getNumericValue Character a.charAt(i) a.charAt a 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){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}}} public class Main {
    public static void main(String[] args){
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}}} Main
import java.util.*;

public class Main {
    public static void main(String[] args){
     Scanner sc= new Scanner(System.in);
     while(true){
String a= sc.next();
    
     if(a.equals("0")) 
         break;
     
     
     int sum= 0;
     
     
     for(int i= 0;i<a.length();i++)
{ 
    sum+= Character.getNumericValue(a.charAt(i));
              
     } 
     
     System.out.println(sum); 
    

   
}}}


