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.awt.*;
import java.awt.geom.*;
import java.io.*;

import java.util.*;
class Main {

	static char[] xx = new char[] {'S','H','C','D'};
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x1 = sc.nextDouble();
		double y1 = sc.nextDouble();
		double x2 = sc.nextDouble();
		double y2 = sc.nextDouble();
		
		System.out.printf("%.8f", Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2)));

	}
}