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 Python3 (judge verdict: Accepted)

import math

x1, y1, x2, y2 = map(float, input().split())

d = math.sqrt((x2 - x1)**2 + (y2 - y1)**2)  
print("{:.8f}".format(d))