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: Wrong Answer)

lst=input().split()
lst=list(map(lambda i:float(i),lst))
x_1=lst[0]
x_2=lst[1]
y_1=lst[2]
y_2=lst[3]
dis=((x_1-x_2)**2+(y_1-y_2)**2)**(1/2)
print("{:.8}".format(dis))