関連ワード:  find vowels in a string python    count vowels in a string python    count vowels in a string python using for loop    count vowels in a string python using while loop    count vowels in a string python code    count vowels in a string python simple code    check vowels in a string python    count vowels in a string python leetcode    count vowels in a string python without function    find vowels in string python using for loop