%
{
  #include <stdio.h>
  int flag = 0; 
%} 

%%
 [a - z.0 - 9 _] + @[a - z] + ".com"
flag = 1; 
%%

int main() {
 
  printf("Please Enter your email: ");
  yylex();
  if (flag == 1)
    printf("This email is accepted");
  else
    printf("This email is not Accepted");
}