class Vector2():
    def __init__(self,x=0,y=0):
        self.x=x
        self.y=y

    def __neg__(self):
        return Vector2(-self.x,-self.y)
    
    def __add__(self,other):
        v=Vector2()
        v.x=self.x+other.x
        v.y=self.y+other.y
        return v

    def __sub__(self,other):
        return self+(-other)

    def inner(u,v):
        return u.x*v.x+u.y*v.y

    def __str__(self):
        return "{} {}".format(self.x,self.y)

X=[0,0,0]
Y=[0,0,0]
X[0],Y[0],X[1],Y[1],X[2],Y[2]=map(int,input().split())

V=[]
for k in range(3):
    V.append(Vector2(X[k],Y[k]))

f=0
for i in range(3):
    j=(i+1)%3
    k=(i-1)%3

    u,v,w=V[i],V[j],V[k]
    
    if (f==0) and ((v-u).inner(v-u)==(w-u).inner(w-u)) and (v-u).inner(w-u)==0:
        f=1
        print(-u+v+w)

if f==0:
    print(-1)