# coding: utf-8

allXY = [int(i) for i in input().rstrip().split(" ")]
xList = list(set([x for (index, x) in enumerate(allXY) if index % 2 == 0]))
yList = list(set([y for (index, y) in enumerate(allXY) if index % 2 == 1]))

canSquare = True
if len(xList) != 2 or len(yList) != 2:
    canSquare = False

ans = -1
if canSquare:
    x = [p for p in xList if len([sub for sub in xList if sub == p]) == 1][0]
    y = [p for p in yList if len([sub for sub in yList if sub == p]) == 1][0]
    ans = str(x) + " " + str(y)

print(ans)