#include <iostream>
using namespace std;

class B;

class A
{
    int x;

public:
    void setData(int n)
    {
        x = n;
    }
    friend void findMax(A, B);
    friend void swapValues(A &, B &);
    friend void show(A, B);
};

class B
{
    int y;

public:
    void setData(int n)
    {
        y = n;
    }
    friend void findMax(A, B);
    friend void swapValues(A &, B &);
    friend void show(A, B);
};

void findMax(A a, B b)
{
    if (a.x > b.y)
        cout << "Maximum is " << a.x << endl;
    else
        cout << "Maximum is " << b.y << endl;
}

void swapValues(A &a, B &b)
{
    int temp = a.x;
    a.x = b.y;
    b.y = temp;
}

void show(A a, B b)
{
    cout << "A = " << a.x << ", B = " << b.y << endl;
}

int main()
{
    A a;
    B b;
    int n1, n2;

    cout << "Enter value for class A: ";
    cin >> n1;
    cout << "Enter value for class B: ";
    cin >> n2;

    a.setData(n1);
    b.setData(n2);

    show(a, b);
    findMax(a, b);

    swapValues(a, b);
    cout << "After swapping: ";
    show(a, b);

    return 0;
}