Problem:
Distance

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.

Sample Input

0 0 1 1

Sample Output

1.41421356

Solution in JAVA (judge verdict: Accepted)

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
public static void main (String[] args) throws java.lang.Exception
{
	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.abs(x2 - x1);
	double y = Math.abs(y2 - y1);
	
	System.out.println(Math.sqrt(x * x + y * y));


}
}