#include <iostream>

using namespace std;

template<typename T>
class Pair {
public:
    Pair(T a, T b)
    {
        this->a1 = a;
        this->b1 = b;
    }
    ~Pair() {}
    void swap()
    {
        T tmp = this->a1;
        this->a1 = this->b1;
        this->b1 = tmp;
    }
    T a()
    {
        return this->a1;

    }
    T b()
    {
        return this->b1;

    }
    T a1;
    T b1;
};