http://acm.hdu.edu.cn/showproblem.php?pid=1002

PE   由于最后一个CASE不须要输出空行

import java.math.BigInteger;

import java.util.Scanner;

public class Main {

	public static void main(String args[]){

		Scanner in = new Scanner(System.in);

		int ncase;

		ncase = in.nextInt();

		for(int i=1;i<=ncase;i++){

			BigInteger a= in.nextBigInteger();

			BigInteger b= in.nextBigInteger();

			System.out.println("Case" + " " + i + ":");

			System.out.println(a + " + " + b + " = " + a.add(b));

			if(i<ncase)System.out.println();

		}

	}

}