ch=input("")
if((ch>='a' and ch<='z') or (ch>='A' and ch<='Z')):
	if(ch=='a',ch=='e',ch=='i',ch=='o',ch=='u',ch=='A',ch=='E',ch=='I',ch=='O',ch=='U'):
		print("Vowel")
	else:
			print("Constant")
else:
	print("invalid")
		
