def count_vowels(s: str) -> int:
    count = 0
    for ch in range(len(s)):
        if (s[ch] == "а" or s[ch] == "е" or s[ch] == "и" or s[ch] == "ы" or s[ch] == "о" or s[ch] == "у" or s[
            ch] == "ю" or s[ch] == "я" or s[ch] == "э" or s[ch] == "а"):
            count += 1
            # print(s[ch])
    return count


def main():
    print(count_vowels("Привет мир"))


if __name__ == "__main__":    main()