%{
  int num_lines = 0;
  int num_chars = 0;
%}
%%
\n {++num_lines; ++num_chars;}
.  {++num_chars;}
%%
int main(int argc, char **argv)
{
  yylex();
  printf("# of lines = %d, # of chars = %d\n",
         num_lines, num_chars);
}