program xxor;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var a,b,x:int64;
p:boolean;
begin
readln(a,b);
x:=0; p:=false;
while  not(p)and(x<=a div 2) do
begin
if (x xor (a-x))= b then begin p:=true; writeln(x,' ',a-x);end;
x:=x+1;
end;
if not(p) then writeln(-1);
readln;
end.