import sys

_p = [int(i) for i in input().strip().split(" ")]
p = []
for i in range(0,len(_p)-1,2):
    p.append([_p[i],_p[i+1]])

for i in range(len(p)):
    x, y =  p[i][0], p[i][1]
    d = []
    for j in range(len(p)):
        if i == j:
            continue
        d.append((x-p[j][0])**2 + (y-p[j][1])**2)

    if d[0] == d[1]:
        x2, y2 = p[i-1][0], p[i-1][1]
        if (i+1) == len(p):
            x3, y3 = p[0][0], p[0][1]
        else:
            x3, y3 = p[i+1][0], p[i+1][1]
        if (x2-x)*(x3-x) + (y2-y)*(y3-y) != 0:
            break
        v = [x2-x, y2-y]
        w = [x3+v[0], y3+v[1]]
        print("%d %d"%(w[0],w[1]))
        sys.exit(0)
         
print(-1)