https://www.acmicpc.net/problem/18409
18409번: 母音を数える (Counting Vowels)
長さ N の英小文字からなる文字列 S が与えられる．S のうち母音字の個数，つまり a，i，u，e，o の個数の総和を求めよ．
www.acmicpc.net
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def sol(s):
answer = 0
vowels = ['a','e','i','o','u']
for vowel in vowels:
answer+=s.count(vowel)
return answer
if __name__ == '__main__':
len_s = int(input())
s = input()
print(sol(s))
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