import java.math.BigInteger;
import java.util.Scanner;
public class Main//注意刷题时的java格式
{
    public static void main(String[] args)
    { 
        BigInteger a,b,d;
        String c = "0";
        d = new BigInteger(c);//将c转化为大数形式，用d保存
        Scanner in = new Scanner(System.in);
        while(in.hasNextBigInteger())
        {
            a = in.nextBigInteger();
            b = in.nextBigInteger();
            if(a.compareTo(d) == 0 && b.compareTo(d) == 0 )//注意用一个大数类自带方法来判断两个大数是否相等
                break;
            System.out.println(a.add(b));
        }
    }
}