options {
  STATIC = false;
}

PARSER_BEGIN(Exp_avaliator)
  import java.io.PrintStream ;
  class Exp_avaliator {
    public static void main( String[] args ) 
      throws ParseException, TokenMgrError, NumberFormatException {
        
        while (true) {
          try {
            Exp_avaliator parser = new Exp_avaliator( System.in );

            parser.Start( System.out ) ;          
          } catch (Exception e) {
            System.out.println("Rejeitado!");
          }
        }

    }
  }
PARSER_END(Exp_avaliator)

SKIP : { " " } 
SKIP : { "\n" | "\r" | "\r\n" } 
TOKEN : { < PLUS : "+" > } 
TOKEN : { < MINUS : "-" > }
TOKEN : { < TIMES : "*" > } 
TOKEN : { < DIVIDE : "/" > }
TOKEN : { < END : ";" > }
TOKEN : { < OPEN_PAR : "(" > } 
TOKEN : { < CLOSE_PAR : ")" > } 
TOKEN : { < PREVIOUS : "$" > }

TOKEN : { < NUMBER : <DIGITS> | <DIGITS> "." <DIGITS> | <DIGITS> "." | "." <DIGITS> > } 
TOKEN : { < #DIGITS : (["0"-"9"])+ > }

void Start(PrintStream printStream) throws NumberFormatException : 
{} 
{
  (
    Exp()
    <END>
    {
      System.out.println("Aceito!!");
    }
  )*
  <EOF>
}

void Exp() throws NumberFormatException :
{}
{
  Prim()
  (
    (<PLUS> | <MINUS> | <DIVIDE> | <TIMES>) Prim()
  )*
}

void Prim() throws NumberFormatException :
{}
{
  <NUMBER> | <OPEN_PAR> Exp() <CLOSE_PAR> | <MINUS> Prim()
}