var a, a_t, b, bb, x, y, pow : uint64; b_2, a_2 : string; i : integer;

procedure to_bin;
begin
  b_2:='';
  if b = 0 then
    b_2:='0';
  while b>0 do
    begin
      if b mod 2 = 1 then
        b_2 := '1' + b_2
      else
        b_2 := '0' + b_2;
      b := b div 2;
    end;
  //////////////////////////////
    while Length(b_2) <> 64 do
        b_2 := '0'+b_2;
end;

begin
  readln(a);
  readln(b);
  a_t := a;
  to_bin;

  pow:=9223372036854775808;
I := 1;
  While pow<>0 do
    begin
      if (b_2[i] = '1')and(pow<=a_t) then
        begin
          y := y+pow;
          a_t := a_t-pow;
        end
      else if (pow  <> 9223372036854775808 ) then // шоб не вылезло из 64 бит
      if pow*2<=a_t then
        begin
          x := x+pow;
          y := y+pow;
          a_t := a_t-pow*2;
        end;
     //Writeln(x, ' ', y, ' ',pow);
      pow := pow div 2;
      Inc(i);
    end;

  if x+y = a then
    write(x,' ',y)
  else
    write(-1);
  readln;
end.