%{
#include <stdio.h>
#include <stdlib.h>
%}
 
%%
[0-9]+    {
              int num = atoi(yytext);
              if (num % 2 == 0)
                  printf("%s is even\n", yytext);
              else
                  printf("%s is odd\n", yytext);
          }
 
[a-zA-Z0-9]+   {
              printf("%s is an invalid input\n", yytext);
          }
 
.|\n      ;   // Ignore other characters
%%
 
int main() {
    printf("Enter a string: ");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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