#include <iostream>
#include <string>

using namespace std;

int main()
{

	const string USERNAME = "arvin";
	const string PASSWORD = "123456";

	string username, password;


	cout << "Enter Username : ";
	cin >> username;

	if (username.length() < )
	{
		cout << "Username length must be atleast 4 characters long.";
	}
	else
	{

		cout << "Enter Password : ";
		cin >> password;

		if (password.length() < 6)
		{
			cout << "Password length must be atleast 6 characters long.";
		}
		else
		{

			if (username == USERNAME && password == PASSWORD)
			{
				cout << "User credentials are correct!!!" << endl;
			}
			else
			{
				cout << "Invalid login details" << endl;
			}
		}
	}
	system("pause");
	return 0;
}