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;


public class Main {
	public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
	double x1 = scan.nextDouble();
	double y1 = scan.nextDouble();
	double x2 = scan.nextDouble();
	double y2 = scan.nextDouble();
	double X = Math.pow(x2 - x1, 2);
	double Y = Math.pow(y2 - y1, 2);
	double len = Math.sqrt(X + Y);
	System.out.println(len);
	}
}