Very basic question about Flex

Hi everyone,

i've started to read the lex and yacc book and the bison and flex book. 
now in the first example they have the following code:

%{
/**
  * First example program for flex
  *
  */
%}

%%

is |
am |
are |
where |
was |
be |
being |
been |
do |
does |
did |
should |
can |
could |
has |
have |
had |
go { printf("%s is a verb\n", yytext); }

[a-zA-Z]+ { printf("%s is not a verb", yytext); }

.|\n { ECHO; /* normal default anyway */ }

%%

int main(int argc, char **argv)
{
     yylex();
}

Now my question is when i enter one of the verbs it's working normaly 
like expected, but when i enter for example 234someword i also get the 
messsage %s is not a verb but i've no rule saying that, i've only 
[a-zA-Z]+ to catch this situation, why does he also react on word that 
begin with a number ??


best regards!




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