Problem: Write a program which calculates the distance between two points P1(x1, y1) and P2(x2, y2).



Input

Four real numbers x1, y1, x2 and y2 are given in a line.

Output

Print the distance in real number. The output should not contain an absolute error greater than 10-4.

Example

Input

0 0 1 1


Output

1.41421356

Solution (in JAVA):

Solution:
import java.util.Scanner;
import java.lang.Math;

public class Main{
    public static void main(String args[]){
        Scanner input = new Scanner(System.in);
        double x1 = input.nextDouble();
        double x2 = input.nextDouble();
        double y1 = input.nextDouble();
        double y2 = input.nextDouble();
        double dis = Math.hypot((y1 - x1), (y2 - x2));
        System.out.println(dis);
        
    }
}