#v2x-v1y=v2x0-v1y0
#(y2-y1)⋅(x-x1)=(x2-x1)⋅(y-y1)

x1 = int(input())
x2 = int(input())
y1 = int(input())
y2 = int(input())

def meredekseg(x1,x2,y1,y2):
    y3 = (y2-y1)
    x3 = (x2 - x1)
    
    
fel-tiz = 10

3harom = 3