%{
#include <stdio.h>
#include <stdlib.h>
 
void yyerror(const char *s);
int yylex(void);
%}
 
%%
 
[0-9]+      { printf("NUMBER: %s\n", yytext); }
[a-zA-Z_][a-zA-Z_0-9]* { printf("IDENTIFIER: %s\n", yytext); }
"+"|"-"|"*"|"/" { printf("OPERATOR: %s\n", yytext); }
\n          { /* Ignore newlines */ }
[ \t]        { /* Ignore whitespace */ }
.            { printf("UNKNOWN: %s\n", yytext); }
 
%%
 
int main(void) {
    yylex();
    return 0;
}
 
void yyerror(const char *s) {
    fprintf(stderr, "Error: %s\n", s);
}
 

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