%{
#include <stdio.h>
%}

%%

if|else|break { printf("%s is a keyword\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]* { printf("%s is an identifier\n", yytext); }
.|\n { Echo; }

%%

int main() {
    printf("Enter a C program: ");
    yylex();
    return 0;
}

int yywrap() {
    return 1;
}