function Main(input) {
  input = input.trim()
switch(input){
  case "a":
  case "i":
  case "u":
  case "e":
  case "o":
  console.log("vowel");
  break;
  default:
  console.log("consonant");
    break;
}
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));