%{
    #include <iostream>
    #include "tokens.h"
    using namespace std;

    int Line = 1;

%}
%option noyywrap
%option nounput

A [a-z]
N [0-9]
AN [a-z0-9]

%%
.    cout << "Line " << Line << ": lexical error `" << yytext[0] << "'\n";