#!/bin/python3

import sys

numbers = "0123456789"
lower_case = "abcdefghijklmnopqrstuvwxyz"
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
special_characters = "!@#$%^&*()-+"

def minimumNumber(n, password):
    numbers_exist = not any(map(lambda c: c in numbers, password))
    lower_case_exist = not any(map(lambda c: c in lower_case, password))
    upper_case_exist = not any(map(lambda c: c in upper_case, password))
    special_characters_exist = not any(map(lambda c: c in special_characters, password))
    res = sum(map(int, [numbers_exist, lower_case_exist, upper_case_exist, special_characters_exist]))
    res += max(0, 6 - (res + n))
    return res

if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)