import java.util.Scanner;

public class P3_ExchangeIntegers {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int a = Integer.parseInt(scan.nextLine());
        int b = Integer.parseInt(scan.nextLine());

        int tempB = b;

        b = a;


        System.out.printf("Before:%n a = %d%n b = %d%n", a , tempB);
        System.out.printf("After:%n a = %d%n b = %d%n", tempB, b);











    }
}