#include <iostream>
#include <vector>
#include <utility>

using namespace std;

template<typename T>
class Matrix {
private:
    vector<vector<T>> m;
public:
    Matrix(const vector<vector<T>> &x) {
        m = x;
    }

    pair<size_t, size_t> size() const {
        size_t a = m.size();
        size_t b = m[0].size();
        return {a, b};
    }

    const vector<T> &operator[](size_t i) const {
        return m[i];
    }
};

template<typename T>
std::ostream &operator<<(std::ostream &out, const Matrix<T> &m) {
    for (long unsigned int i = 0; i < m.size().first; ++i) {
        for (long unsigned int j = 0; j < m.size().second; ++j) {
            if (j != 0 && j != m.size().second) {
                out << '\t';
            }
            out << m[i][j];
        }
        if (i != m.size().first) {
            out << '\n';
        }
    }
    return out;
}