require 'matrix'
ax,ay,bx,by,cx,cy=gets.split.map! &:to_i

def pr(v); puts "#{v[0]} #{v[1]}"; end

p1 = Vector[ax,ay]
p2 = Vector[bx,by]
p3 = Vector[cx,cy]

v1 = p1-p2
v2 = p2-p3
v3 = p3-p1

if v1.dot(v2) == 0
    if v1.r==v2.r
        pr p1-v2
        exit
    end
end
if v2.dot(v3) == 0
    if v2.r==v3.r
        pr p2-v3
        exit
    end
end
if v3.dot(v1) == 0
    if v3.r==v1.r
        pr p3-v1
        exit
    end
end
p -1