p=input()
if((p<='A' and p<='Z') or (p<='a' and p<='z')):
 if(p=='a',p=='e',p=='i',p=='o',p=='u',p=='A',p=='E',p=='I',p=='O',p=='U'):
  print('vowel')
  else:
   print('Consonant')
else:
  print('invalid')
