import numpy as np

X1, Y1, X2, Y2, X3, Y3 = map(int, input().split())
a = np.array([X1, Y1])
b = np.array([X2, Y2])
c = np.array([X3, Y3])
ab = np.linalg.norm(a - b)
bc = np.linalg.norm(b - c)
ca = np.linalg.norm(c - a)
ans = (-1, )
if ab == ca:
    if np.inner(b - a, c - a) == 0:
        ans = b + c - a
elif ab == bc:
    if np.inner(a - b, c - b) == 0:
        ans = a + c - b
elif bc == ca:
    if np.inner(c - a, c - b) == 0:
        ans = a + b - c
print(*ans)