a=b=c=d=gets.split.each_slice(2).map{|i,j|Complex i.to_i,j.to_i}
puts a.find{|i|b,c=a-[d=i];(i-b).abs2==(e=(i-c).abs2)&&e*2==(b-c).abs2}?(b+c-d).rect*" ":-1