import re

numbers = "0123456789"
lower_case = "abcdefghijklmnopqrstuvwxyz"
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
special_characters = "!@#$%^&*()-+"
has_num = False
has_special = False
has_upper = False
has_lower = False
long_enough = False

def is_strong(password):
    global has_num
    global has_special
    global has_upper
    global has_lower
    global long_enough
    
    if len(password) >= 6:
        long_enough = True

    for char in password:
        if not has_lower and char in lower_case:
            has_lower = True
        if not has_upper and char in upper_case:
            has_upper = True
        if not has_special and char in special_characters:
            has_special = True
        if not has_num and char in numbers:
            has_num = True

num_chars = input()
password = input()
added_char_count = 0
length = len(password)
is_strong(password)

# print(has_num)
# print(has_special)
# print(has_upper)
# print(has_lower)

while (not (has_num and has_special and has_lower and has_upper and long_enough)):
    if not has_num:
        added_char_count += 1
        has_num = True
    elif not has_special:
        added_char_count += 1
        has_special = True
    elif not has_upper:
        added_char_count += 1
        has_upper = True
    elif not has_lower:
        added_char_count += 1
        has_lower = True
    else:
        added_char_count += 1
    long_enough = ((length + added_char_count) >= 6)

print(added_char_count)