In the world of Latin Alphabets, there seemed to be a catastrophe! All the vowels went missing. The other alphabets got disturbed and began the search operation.
While searching they stumbled upon a garbage of letters. Can you help them find if the this garbage contains ALL the vowels ?  

Input:
FIrst line contains N , the size of the garbage of letters.
Second line contains the letters (only lowercase).  

Output:
Print "YES" (without the quotes) if all vowels are found in the garbage, "NO" (without the quotes) otherwise.   

Constraints:
1 ≤ N ≤ 10000  

SAMPLE INPUT
8
atuongih

SAMPLE OUTPUT
NO
'''
# Read input from stdin and provide input before running code

name = raw_input('What is your name?\n')
print 'Hi, %s.' % name
'''
n = raw_input()
st = raw_input()
flag=0
if st.find("a")>-1:
	if st.find("e")>-1:
		if st.find("i")>-1:
			if st.find("o")>-1:
				if st.find("u")>-1:
					flag=1
if flag==1:
	print "YES"
else:
	print "NO"