#include <iostream>

using namespace std;

class PhoneNumber {

public:
	friend ostream& operator<<(ostream&, const PhoneNumber&);
	friend istream& operator>>(istream&, PhoneNumber&);

private:
	char first[4];  // 3 + '\0'
	char second[4];  // 3 + '\0'
	char third[3];   // 2 + '\0'
	char fourth[3]; // 2 + '\0'

};

ostream& operator<<(ostream& output, const PhoneNumber& num) {

	output << num.first << "-" << num.second << "-" << num.third << '-' << num.fourth;

	return output; //разрешить конкатенацию
}

istream& operator>>(istream& input, PhoneNumber& num) {

	input.getline(num.first, 4);
	cout << "num.first = " << num.first << endl;
	input.ignore();

	input.getline(num.second, 4);
	cout << "num.second = " << num.second << endl;
	input.ignore();

	input.getline(num.third, 3);
	cout << "num.third = " << num.third << endl;
	input.ignore();

	input.getline(num.fourth, 3);
	cout << "num.fourth = " << num.fourth << endl;

	return input; //разрешить конкатенацию
}


int main() {

	PhoneNumber phone;

	std::cout << "Enter a phone number in the form \n 123-456-78-90:\n";

	cin >> phone;

	cout << "The entered number was: " << phone << std::endl;

	return 0;
}