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#include <iostream>
#include <string>
#include <fstream>
#include <exception>
using namespace std;



ifstream in("input.txt");
ofstream out("output.txt");


class Rectangle {
    int a;
    int b;
public:


    void Print()
    {
        out << "A = " << a << ", B = " << b << '\n';
    }
    int Perimeter() {
        return 2 * (a + b);
    }
    int Area() {
        return a * b;
    }
    void setA(int value) {
        this->a = value;
    }
    void setB(int value) {
        this->b = value;
    }
    bool isSquare() {
        return (a == b);
    }


    const Rectangle operator++();
    const Rectangle operator--();


};
const Rectangle Rectangle::operator++()
{
    this->a++;
    this->b++;
    return *this;
}

const Rectangle Rectangle::operator--()
{
    this->a--;
    this->b--;
    return *this;
}
int main()
{
    Rectangle a;
    a.setA(10);
    a.setB(15);
    a.Print();
    if (a.isSquare())
        out << "This is square\n";
    else
        out << "This isn't square\n";
    out << "Area = " << a.Area() << endl;
    out << "Perimeter = " << a.Perimeter() << endl;

    --a;

    a.Print();
    if (a.isSquare())
        out << "This is square\n";
    else
        out << "This isn't square\n";
    out << "Area = " << a.Area() << endl;
    out << "Perimeter = " << a.Perimeter() << endl;

    return 0;
}