using System;
using System.Drawing;
using System.Linq;

class Program
{
    public static int DistanceSquare(Point first, Point second)
    {
        var dx = first.X - second.X;
        var dy = first.Y - second.Y;
        return dx*dx + dy*dy;
    }

    private static Point ToVector(Point first, Point second)
    {
        return new Point(second.X - first.X, second.Y - first.Y);
    }

    private static bool IsDiagnostic(Point firstVector, Point secondVector)
    {
        if (firstVector.X*secondVector.X + firstVector.Y*secondVector.Y == 0)
        {
            return true;
        }
        return false;
    }

    private static Point CreateFourth(Point opposite, Point lineStart, Point lineEnd)
    {
        var x = opposite.X + (lineStart.X + lineEnd.X)/2;
        var y = opposite.Y + (lineStart.Y + lineEnd.Y)/2;
        return new Point(x, y);
    }


    public static void Main(string[] args)
    {
        var values = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        Point[] points = new Point[3];
        points[0] = new Point(values[0], values[1]);
        points[1] = new Point(values[2], values[3]);
        points[2] = new Point(values[4], values[5]);
        if (DistanceSquare(points[0], points[1]) == DistanceSquare(points[1], points[2]))
        {
            if (!IsDiagnostic(ToVector(points[1], points[0]), ToVector(points[2], points[1])))
            {
                Console.WriteLine(-1);
                return;                
            }
            var fourth = CreateFourth(points[1], points[0], points[2]);
            Console.WriteLine("{0} {1}", fourth.X, fourth.Y);
            return;

        }
        if (DistanceSquare(points[0], points[2]) != DistanceSquare(points[1], points[2]))
        {
            if (!IsDiagnostic(ToVector(points[2], points[0]), ToVector(points[2], points[1])))
            {
                Console.WriteLine(-1);
                return;
            }
            var fourth = CreateFourth(points[2], points[0], points[1]);
            Console.WriteLine("{0} {1}", fourth.X, fourth.Y);
            return;
        }
        if (DistanceSquare(points[0], points[1]) != DistanceSquare(points[0], points[2]))
        {
            if (!IsDiagnostic(ToVector(points[1], points[0]), ToVector(points[2], points[0])))
            {
                Console.WriteLine(-1);
                return;
            }
            var fourth = CreateFourth(points[0], points[2], points[1]);
            Console.WriteLine("{0} {1}", fourth.X, fourth.Y);
            return;
        }
        Console.WriteLine(-1);
    }
}