# A program that reads two points A(x1,y1) and B(x2,y2),
# computes the Euclidean distance between them, and prints the result.

import math

print "This program computes the distance between the points A(x1,y1) and B(x2,y2)."

x1 = input("x1: ")
y1 = input("y1: ")
x2 = input("x2: ")
y2 = input("y2: ")

distance = math.sqrt((x1 - x2)**2 + (y1 - y2)**2)

print    # print a blank line
print "The Euclidean distance between A and B is", distance