public static void Start() { string[] numbers = Console.ReadLine() .Split(" ", StringSplitOptions.RemoveEmptyEntries); foreach (var number in numbers) { if (number.Any(char.IsLetter)) { Console.WriteLine("Invalid number!"); } else { var smartPhone = new Smartphone(number); Console.WriteLine(smartPhone.Call()); } } string[] sites = Console.ReadLine() .Split(" ", StringSplitOptions.RemoveEmptyEntries); foreach (var site in sites) { if (site.Any(char.IsDigit)) { Console.WriteLine("Invalid URL!"); } else { var smartPhone = new Smartphone(site); Console.WriteLine(smartPhone.Browse() + "!"); } } }