# All Vowels

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#
#   Vowels are very essential characters to form any meaningful word in English dictionary. There are 5 vowels in
#   English language - a, e, i, o u. You are given a randoms string containing only lowercase letters and you need
#   to find if the string contains ALL the vowels.
#
#   Input:
#   FIrst line contains N , the size of the string. Second line contains the letters (only lowercase).
#
#   Output:
#   Print "YES" (without the quotes) if all vowels are found in the string, "NO" (without the quotes) otherwise.
#
#   Constraints:
#   The size of the string will not be greater than 10,000
#   1 ≤ N ≤ 10000
#
#   SAMPLE INPUT
#   8
#   atuongih
#
#   SAMPLE OUTPUT
#   NO
#
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