n = int(input())
s = input()

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


added = 0

if not any(char in numbers for char in s):
    s += '4' 
    added += 1
if not any(char in lower_case for char in s):
    s += 'a'
    added += 1
if not any(char in upper_case for char in s):
    s += 'A'
    added += 1
if not any(char in special_characters for char in s):
    s += '*'
    added += 1
    
if len(s) < 6:
    added += (6 - len(s))

print(added)