A = "aeiou"
while True:
a = input()
if a == 'end':
break
check = True
for i in a:
if i in A:
break
else:
check = False
L = [0 if i in A else 1 for i in a ]
for i in range(0,len(L)-2,1):
if L[i] == L[i+1] == L[i+2]:
check = False
break
for i in range(0,len(L)-1,1):
if a[i] == a[i+1] and a[i] not in "eo":
check = False
break
if check:
print("<{}> is acceptable.".format(a))
else:
print("<{}> is not acceptable.".format(a))