Program vektorduplazo;
var a,b,c,d:real;
procedure vd(x1,y1:real;var x2,y2:real);
begin
     x2:=2*x2-x1;
     y2:=2*y2-y1
end;
begin
     readln(a);
     readln(b);
     readln(c);
     readln(d);
     vd(a,b,c,d);
     writeln(a:10:2,b:10:2,c:10:2,d:10:2);
     readln
end.