class Program
    {
        static void Main(string[] args)
        {
            int[,] cordinates = new int[2, 2];

            Console.Write("Enter x for A: ");
            cordinates[0, 0] = int.Parse(Console.ReadLine());
            Console.Write("Enter y for A: ");
            cordinates[0, 1] = int.Parse(Console.ReadLine());

            Console.Write("Enter x for B: ");
            cordinates[1, 0] = int.Parse(Console.ReadLine());
            Console.Write("Enter y for B: ");
            cordinates[1, 1] = int.Parse(Console.ReadLine());

            double distance = Math.Sqrt(Math.Pow(cordinates[0, 0] - cordinates[1, 0], 2)
                + Math.Pow(cordinates[0, 1] - cordinates[1, 1], 2));

            Console.WriteLine("Distance between A and B is: {0:0.000}", distance);
        }
    }