import java.util.*; import java.io.*; import java.awt.geom.*; import static java.util.Arrays.*; class Main{ public static void main(String[] args){ Scanner stdIn = new Scanner(System.in); PrintWriter out = new PrintWriter(System.out); int[] x = new int[4]; int[] y = new int[4]; double[] length = new double[4]; double l = 0; int n = 0; boolean flag = false; for(int i=0;i<3;i++){ x[i] = Integer.parseInt(stdIn.next()); y[i] = Integer.parseInt(stdIn.next()); } for(int i=0;i<3;i++){ length[i] = Math.sqrt(Math.pow(x[i] - x[(i+1)%3],2)+Math.pow(y[i]-y[(i+1)%3],2)); } for(int i=0;i<3;i++){ if(length[i]==length[(i+1)%3]){ n = (i+1)%3; flag = true; } } Vector v1 = new Vector(x[n],y[n],x[(n+1)%3],y[(n+1)%3]); Vector v2 = new Vector(x[n],y[n],x[(n+2)%3],y[(n+2)%3]); if(flag && v1.dot(v2)==0){ v1.add(v2); out.println((int)(x[n]+v1.x)+" "+(int)(y[n]+v1.y)); out.flush(); return; } out.println(-1); out.flush(); } } class Vector{ public final double EPS = Math.pow(10,-8); public double x,y; Vector( double x1 , double y1 , double x2 , double y2 ){ this.x = x2 - x1; this.y = y2 - y1; } double dot( Vector a ){ return this.x * a.x + this.y * a.y; } double cross( Vector a ){ return this.x * a.y - this.y * a.x; } void add( Vector a ){ this.x += a.x; this.y += a.y; } void sub( Vector a ){ this.x -= a.x; this.y -= a.y; } void mul( double z ){ this.x *= z; this.y *= z; } void div( double z ){ this.x /= z; this.y /= z; } double abs(){ return Math.sqrt(norm()); } double norm(){ return this.x * this.x + this.y * this.y; } double cos(Vector a){ Vector b = new Vector(0,0,this.x,this.y); Vector c = new Vector(a.x,a.y,b.x,b.y); if(judge(a.dot(b))){ return 0.0; } double cos = (Math.pow(a.abs(),2)+Math.pow(b.abs(),2)-Math.pow(c.abs(),2))/(2*a.abs()*b.abs()); return cos; } double sin(Vector a){ Vector b = new Vector(0,0,this.x,this.y); if(judge(a.cross(b))){ return 0.0; } double height = a.cross(b)/a.abs(); double sin = b.abs()/height; return sin; } double cosLength( double a , double b , double c ){ double cos = (Math.pow(a,2) + Math.pow(b,2) - Math.pow(c,2))/(2 * a * b); if(judge(cos)){ return 0.0; } return cos; } double sinLength( double a , double b , double c ){ double cos = cosLength(a,b,c); if(judge(1-cos)){ return 0.0; } return Math.sqrt(1-Math.pow(cos,2)); } void projection( Vector a ){ double cos = dot(a)/(abs() * a.abs()); double frac = a.abs() * cos/abs(); mul(frac); } Vector reflection( Vector a ){ projection(a); return new Vector(a.x,a.y,this.x,this.y); } boolean judgeisOrthogonal( Vector a ){ return judge(dot(a)) ? true : false; } boolean judgeisParallel( Vector a ){ return judge(cross(a)) ? true : false; } boolean judge( double a ){ return Math.abs(a)