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 {
  def main(args: Array[String]): Unit = {
    val scanner = new java.util.Scanner(System.in)
    val x1, y1, x2, y2 = scanner.nextDouble
    val xd = x2 - x1
    val yd = y2 - y1
    println(f"${math.sqrt(xd * xd + yd * yd)}%.5f")
  }
}