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])
   print(count)






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



if __name__ == "__main__":    main()