function main(input) {
  input=input.trim();
  const op = input.split(" ")[0];
  if(op=="a"||op=="e"||op=="i"||op=="o"||op=="u"){
    console.log("vowel");
  }else{
    console.log("consonant");
  }

}



main(require('fs').readFileSync('/dev/stdin', 'utf8'));