Distance Between Points

import math


class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    @classmethod
    def calculate(cls, p1, p2):
        cls.distance = math.sqrt(math.pow(p1.x - p2.x, 2) + math.pow(p1.y - p2.y, 2))
        return f"{cls.distance:.3f}"

p1_coordinates = list(map(int, input().split(" ")))
p1 = Point(p1_coordinates[0], p1_coordinates[1])

p2_coordinates = list(map(int, input().split(" ")))
p2 = Point(p2_coordinates[0], p2_coordinates[1])

print(Point.calculate(p1, p2))