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 Scala (judge verdict: Accepted)

object Main extends App{
  val sc = new java.util.Scanner(System.in)
  val x1, y1, x2, y2 = sc.nextDouble
  val r = math.sqrt(math.pow((x1 - x2), 2) + math.pow((y1 - y2), 2))
  println(r)
}