%{
int vowel_count = 0;
int consonant_count = 0;
%}
 
%%
[a-zA-Z]    {
                if (strchr("aeiouAEIOU", yytext[0]))
                    ++vowel_count;
                else
                    ++consonant_count;
            }
.           ; /* Ignore all other characters */
\n          {
                printf("Vowels: %d\n", vowel_count);
                printf("Consonants: %d\n", consonant_count);
                vowel_count = 0;
                consonant_count = 0;
            }
%%
 
int main() {
    yylex();
    return 0;
}
 

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ZWNobyAmcXVvdDtIZWxsbywgV29ybGQhJnF1b3Q7IHwgLi9jb3VudF92b3dlbHNfY29uc29uYW50cwo=

echo "Hello, World!" | ./count_vowels_consonants