%{
#include <stdio.h>
#include <ctype.h>
#define YYDEBUG 1
%}
%token DIGIT
%%
lines : lines line
	|
	;
line	:	expr '\n'	{ printf("%d\n",$1); }
	;
expr	:	expr '+' term	{ $$ = $1 + $3; }
	|	expr '-' term	{ $$ = $1 - $3; }
	| term
	;
term	:	term '*' factor	{ $$ = $1 * $3; }
	|	term '/' factor	{ $$ = $1 / $3; }
	|	term '%' factor	{ $$ = $1 % $3; }
	| factor
	;
factor	:	'(' expr ')'	{ $$ = $2; }
	|	DIGIT
	;
%%
yylex(){
	register c;
	c = getchar();
	if (isdigit(c)) {
		yylval = c-'0';
		return DIGIT;
		}
	return c;
	}
yyerror(s) char *s; {
	fprintf(stderr,"%s\n",s);
	exit(1);
	}
extern int yydebug;
main(argc,argv)char *argv[];{
	yydebug=(argc>1 ? atoi(argv[1]) : 0);
	yyparse();
	}