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
t=int(raw_input())
s=str(raw_input())
i=0
l=[0,0,0,0,0]
while i<t:
	if s[i]=='a':
		l[0]=1
	if s[i]=='e':
		l[1]=1
	if s[i]=='i':
		l[2]=1
	if s[i]=='o':
		l[3]=1
	if s[i]=='u':
		l[4]=1
	i=i+1
if l[0]==1 and l[1]==1 and l[2]==1 and l[3]==1 and l[4]==1:
	print "YES"
else:
	print "NO"