import sys

input = sys.stdin.readline

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

length = int(input())
n = input().strip('\n')
low = 1
up = 1
spec = 1 
num = 1 


for letter in n:
    if letter in numbers:
        num = 0
    if letter in lower_case:
        low = 0
    if letter in upper_case:
        up = 0
    if letter in special_characters:
        spec = 0
    
toAdd = max(6 - len(n), int(num) + int(low) + int(up) + int(spec))
print(toAdd)