import java.util.Scanner;
import java.io.*;
public class InfiniteAdders {
    public static void main(String [] args){
            try{
            Scanner file = new Scanner(new BufferedReader(new FileReader("nums1.txt")));
            Digit head = new Digit();
            head.setDigit(file.nextInt());
            Digit curr = head;
            Digit prev = head;
            while(file.hasNext()){
                curr.setNext(new Digit());
                curr = curr.getNext();
                curr.setDigit(file.nextInt());
                curr.setPrev(prev);
                prev = curr;
        }
        Scanner file1 = new Scanner(new BufferedReader(new FileReader("nums2.txt")));
            Digit head2 = new Digit();
            head2.setDigit(file1.nextInt());
            Digit curr2 = head2;
            Digit prev2 = head2;
            while(file1.hasNext()){
                curr2.setNext(new Digit());
                curr2 = curr2.getNext();
                curr2.setDigit(file1.nextInt());
                curr2.setPrev(prev2);
                prev2 = curr2;
        }
            Digit head3 = new Digit();
            Digit curr3 = head3;
            Digit prev3 = head3;

        int carry = 0;
        while ( curr != null || curr2 != null) {
            curr3.setNext(new Digit());
        if (curr != null && curr2 != null) {
            curr3.digit = curr.digit + curr2.digit + carry;
        }
        if (curr3.digit >= 10) {
               curr3.digit = curr3.digit - (1 * 10);
               carry = 1;
            } else {
                carry = 0;
            }
        if(curr != null && curr2 == null){
            curr3.digit = curr.digit + carry;
            curr = curr.getPrev();
        }
        if(curr == null && curr2 != null){
             curr3.digit = curr2.digit + carry;
             curr2 = curr2.getPrev();
        }
        }
        curr3.getNext();
        curr.setDigit(0);
        curr3.setPrev(prev3);
        prev3 = curr3;
        while (prev3 != null) {
            System.out.print(curr3.getDigit());
            curr3 = prev3.getNext();
        }
    }
        catch(Exception e){
            System.out.println(e.getMessage());
            e.printStackTrace();
    }
}
}