Printf.printf "%s\n"
    (Scanf.sscanf (read_line()) 
                 "%s"  
                 (function 
                     |"a" -> "vowel"
                     |"i" -> "vowel"
                     |"u" -> "vowel"
                     |"e" -> "vowel"
                     |"o" -> "vowel" 
                     |_ -> "consonant"))
