function main(input) {
const a = input.split("\n");
  console.log(a[0]=="a"? "vowel"
			 :a[0]=="e"? "vowel"
             :a[0]=="i"? "vowel"
		     :a[0]=="o"? "vowel"
			 :a[0]=="u"? "vowel"
			 :"consonant");
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));