#include <iostream>
using namespace std;

class A
{
    int x;
public:
    A()
    {
        x = 50;
    }
    friend void show(A a);
};

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

int main()
{
    A a;
    show(a);
    return 0;
}