# Arup Guha
# 1/5/2013
# Solution to Programming Knights Practice Program Chapter 1 Problem 2
# Slope

def main():

    # Get the coordinates of the two points.
    x1 = int(input("Enter the x coordinate of your first point, integers please.\n"))
    y1 = int(input("Enter the y coordinate of your first point, integers please.\n"))
    x2 = int(input("Enter the x coordinate of your first point, integers please.\n"))
    y2 = int(input("Enter the y coordinate of your first point, integers please.\n"))

    # One slash executes regular division.
    slope = (y2-y1)/(x2-x1);

    # Output the result.
    print("The slope between those two points is ",slope,".", sep="")


main()