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 distance = Math.hypot(x1 - x2, y1 - y2);
		System.out.println(String.format("%.8f", distance));
	}
}