Java A+B:
1 import java.io.*;
2 import java.util.*;
3 import java.math.BigInteger;
4 import java.util.Scanner;
5 public class Main
6 {
7 public static void main(String args[]) throws Exception
8 {
9 Scanner in = new Scanner(System.in);
10 while(in.hasNext())
11 {
12 BigInteger a, b;
13 a = in.nextBigInteger();
14 b = in.nextBigInteger();
15 System.out.println(a.add(b));
16 }
17 }
18 }