program cserelo;
var a,b:real;
procedure csere(var x,y:real);
begin
     x:=x+y;
     y:=x-y;
     x:=x-y
end;
begin
     readln(a);
     readln(b);
     csere(a,b);
     writeln(a:10:2);
     writeln(b:10:2);
     readln
end.