#include <iostream>
using namespace std;

class Operationv2 {
    int a;
    int b;

public:
    Operationv2( const int a, const int b )
    : a(a), b(b) {}

    Operationv2()
    : Operationv2( 0, 0 ) {}

    void swap( ) {
        std::swap( a, b );
    }

    friend istream & operator >> ( istream & is, Operationv2 & op ) {
        is >> op.a >> op.b;
        return is;
    }

    friend ostream & operator << ( ostream & os, const Operationv2 & op) {
        os << "A = " << op.a << "\n"
            << "B = " << op.b << std::endl;
        return os;
    }

};


int main() {

    Operationv2 op;
    cout << "Enter value for a and b" << std::endl;
    cin >> op;
    cout << op;
    op.swap( );
    cout << op;
    return 0;
}