%{
#include<stdio.h>
%}

%%
[0-9]        { printf("digit\n"); }
[a-zA-Z]     { printf("character\n"); }
.            { /* do nothing */ }
%%

int main() {
    yylex(); // Start lexical analysis
    return 0;
}

int yywrap() {
    return 1; // Indicates end of file
}