%{
#define YYERROR_VERBOSE
void yyerror(char *);
%}
%verbose
%token JAN ULRICH KIRSTEN BIRGIT EIKE KAI ILLEGAL_CHAR
%%
kinder:           maedchen
                | jungen
                | maedchenOderJungen
                ;
maedchen:         KIRSTEN
                | BIRGIT
                ;
jungen:           JAN
                | ULRICH
                ;
maedchenOderJungen: 
                  EIKE
                | KAI
                ;
%%
void yyerror(char *msg) {
    printf("\n%s\n", msg);
}
int main() {
    return yyparse();
}