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: Wrong Answer)

import static java.lang.System.out;
import java.util.Scanner;

class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double x = scan.nextDouble();
        double y = scan.nextDouble();
        double x2 = scan.nextDouble();
        double y2 = scan.nextDouble();
        double ans = Math.sqrt((x2 - x) * (x2 - x) + (y2 - y) * (y2 - y));
        out.println(String.format("%.7s", String.valueOf(ans)));                
    }
}