#include <iostream>

using namespace std;

class Forma
{
protected:
    int brStrani;
public:
    Forma(int brStrani=0)
    {
        this->brStrani=brStrani;
    }
};

class Kvadrat:public Forma
{
protected:
    int a;
public:
    Kvadrat(int brStrani=0, int a=0):Forma(brStrani)
    {
        this->a=a;
    }

    void pecati()
    {
        cout<<"Broj strani: "<<brStrani<<endl;
        cout<<"Strana a: "<<a<<endl;
    }
};

class Triagolnik:public Forma
{
protected:
    int a;
    int b;
    int c;
public:
    Triagolnik(int brStrani=0, int a=0, int b=0, int c=0):Forma(brStrani)
    {
        this->a=a;
        this->b=b;
        this->c=c;
    }

    void pecati()
    {
        cout<<"Broj strani: "<<brStrani<<endl;
        cout<<"Strana a: "<<a<<endl;
        cout<<"Strana b: "<<b<<endl;
        cout<<"Strana c: "<<c<<endl;
    }
};

class Pravoagolnik:public Forma
{
protected:
    int a;
    int b;
public:
    Pravoagolnik(int brStrani=0, int a=0, int b=0):Forma(brStrani)
    {
        this->a=a;
        this->b=b;
    }
    void pecati()
    {
        cout<<"Broj strani: "<<brStrani<<endl;
        cout<<"Strana a: "<<a<<endl;
        cout<<"Strana b: "<<b<<endl;
    }
};
int main()
{
    Kvadrat k(1,5);
    k.pecati();
    Triagolnik t(3,3,4,5);
    t.pecati();
    Pravoagolnik p(2,10,20);
    p.pecati();

    return 0;
}