#!/usr/bin/env python

# Universalnie funckii dlya vseh lab
## Razdelitel'
def isdelimiter(c):
    if c.isspace() or c == ',':
        return True
    else:
        return False

# Glasnaya
def isvowel(c):
    vowels = set(['a', 'e', 'i', 'o', 'u', 'y'])
    if c.lower() in vowels:
        return True
    else:
        return False

text = raw_input('Vvedite stroku: ')
a = set()
finded = False
for c in list(text):
    if isdelimiter(c):
        a.clear()
    else:
        if isvowel(c):
            if c in a:
                finded = True
                break
            else:
                a.add(c)

if finded:
    print 'NO'
else:
    print 'YES'