import java.util.*;
public class hanukkah
{
    static Scanner reader = new Scanner(System.in);

    public static Stack<Integer> a(Stack<Integer> s1, Stack<Integer> s2)
    {
        int temp=0;
        Stack<Integer> h1 = new Stack<Integer>();
        Stack<Integer> h2 = new Stack<Integer>();
        Stack<Integer> sum = new Stack<Integer>();

        while(!s1.isEmpty() && !s2.isEmpty())
        {
            h1.push(s1.pop());
            h2.push(s2.pop());
        }

        while(!h1.isEmpty() && !h2.isEmpty())
            if(h1.top()+h2.top()<10)
                {
                sum.push(h1.top()+h2.top()+temp);
                s1.push(h1.pop()); s2.push(h2.pop());
                }
            else
            {
                temp = temp+sum.pop()/10;
                sum.push((h1.top()+h2.top()+temp)%10);
                s1.push(h1.pop()); s2.push(h2.pop());
            }


        return sum;
    }

    public static void input(Stack<Integer> s)
    {

        System.out.println("Enter a num. !=0");
        int n = reader.nextInt();
        while(n!=0)
        s.push(n);
    }

    public static void main(String[] args)
    {
        Stack<Integer> s1 = new Stack<Integer>();
        Stack<Integer> s2 = new Stack<Integer>();
        Stack<Integer> sum = new Stack<Integer>();
        input(s1);
        input(s2);

        sum=a(s1, s2);
        System.out.println(sum.toString());
    }






}