program DM;
{$APPTYPE CONSOLE}
uses
  SysUtils;
var
    Arr: array of Integer;
    TempArr: array of Integer;
    Input, Output: string;
    i, j : Integer;
begin
    Read(Input);
    Output := '';
    SetLength(Arr, Length(Input));
    SetLength(TempArr, Length(Input) - 1);
    for i := 0 to Length(Input) - 1 do
        Arr[i] := StrToInt(Input[i + 1]);
    for i := 0 to Length(Input) - 2 do
    begin
        Output := Output + IntToStr(Arr[0]);
        for j := 0 to Length(Arr) - 2 do
            TempArr[j] := Arr[j] xor Arr[j + 1];
        SetLength(Arr, Length(TempArr));
        for j := 0 to Length(TempArr) - 1 do
            Arr[j] := TempArr[j];
        SetLength(TempArr, Length(TempArr) - 1);
    end;
    Output := Output + IntToStr(Arr[0]);
    Write(Output);
end.