internal class Program
{
    static void Main(string[] args)
    {
        string firstName = "Сакутин";
        string lastName = "Роман";
        string temporary;

        Console.WriteLine($"Фамилия - {lastName}, Имя - {firstName}.");

        temporary = firstName;
        firstName = lastName;
        lastName = temporary;

        Console.WriteLine($"Фамилия - {lastName}, Имя - {firstName}.");
    }
}