//============================================================================

// Name        : teststrings.cpp

// Author      : Lasse Nielson

//

// Description : Generation of Test Strings for Regular Expressions

//

// Compile     : g++ -o teststrings teststrings.cpp

//============================================================================

#include <iostream>

#include <string>

#include <sstream>

using namespace std;

string str_email(int n) {

	stringstream ss;

	for (int i = 0; i < n; ++i) {

		for (int j = 0; j < i % 27 + 3; ++j)

			ss << (char) ('a' + (j % 26));

		if (n > i + 1)

			ss << "-";

	}

	ss << "@";

	for (int j = 0; j < 2; ++j) {

		for (int i = 0; i < n + 3; ++i)

			ss << (char) ('a' + ((i + j) % 26));

		ss << ".";

	}

	ss << "com";

	return ss.str();

}

string str_amount(int n) {

	stringstream ss;

	ss << "$";

	for (int i = 0; i < n; ++i) {

		ss << (1 + i) % 10;

		if (n > i + 1 && (n - i) % 3 == 1)

			ss << ",";

	}

	ss << ".53";

	return ss.str();

}

string str_float(int n) {

	stringstream ss;

	ss << "-";

	for (int i = 0; i < n; ++i) {

		ss << (1 + i) % 10;

	}

	ss << ".";

	for (int i = 0; i < n; ++i) {

		ss << (1 + i) % 10;

	}

	ss << "E+";

	for (int i = 0; i < n; ++i) {

		ss << (1 + i) % 10;

	}

	return ss.str();

}

int main() {

        int fin = 10;

	// emails 

        for (int i = 1; i < fin; i++) {

          cout << str_email(i) << endl;

        }

        // dollar amounts

        for (int i = 1; i < fin; i++) {

	  cout << str_amount(i) << endl;

        }

        // float numbers

        for (int i = 1; i < fin; i++) {

	  cout << str_float(i) << endl;

        }

	return 0;

}