DistanceBetweenTwoPoints

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Next
{
    class Program
    {
        static void Main(string[] args)
        {
            // DateTime input = DateTime.ParseExact(
            //     Console.ReadLine(), "d-M-yyyy", System.Globalization.CultureInfo.InvariantCulture
            //     );
            //
            // Console.WriteLine(input.DayOfWeek);
            Point firstPoint = Point.ParsePoint(Console.ReadLine());
            Point secondPoint = Point.ParsePoint(Console.ReadLine());

            double distance = CalcDistance(firstPoint, secondPoint);

            Console.WriteLine($"{distance:f3}");
        }

        private static double CalcDistance(Point firstPoint, Point secondPoint)
        {
            double sideA = Math.Pow((firstPoint.X - secondPoint.X), 2);
            double sideB = Math.Pow((firstPoint.Y - secondPoint.Y), 2);

            return Math.Sqrt(sideA + sideB);

        }

        private static Point ReadPoint(string input)
        {
            int[] inputData = input.Split(' ').Select(int.Parse).ToArray();
            return new Point(inputData[0], inputData[1]);
        }

        class Point
        {
            public int X { get; set; }
            public int Y { get; set; }

            public Point(int xCoord, int yCoord)
            {
                X = xCoord;
                Y = yCoord;
            }

            public static Point ParsePoint(string input)
            {
                int[] inputData = input.Split(' ').Select(int.Parse).ToArray();
                return new Point(inputData[0], inputData[1]);

            }
        }
    }
}