function reserve(n :integer) :integer;
var
  digit, i :integer;
  sign :boolean;

begin
  digit:= 0;
  
  if n < 0 then
  begin
    sign:= false;
    n *= -1;
  end 
  else
    sign:= true;
    
  while n > 0 do
  begin
    i:= n mod 10;
    digit:= digit*10 + i;
    n:= n div 10;
  end;
  
  if sign then
    reserve:= digit
  else
    reserve:= digit * -1;
end;

var
  n :integer;

begin

  readln(n);
  writeln(reserve(n));

end.