import sys
from string import ascii_lowercase, ascii_uppercase

def minimumNumber(n, password):
    pw_set = set(password)
    n_x_chars = 0

    
    if not pw_set & set(ascii_lowercase):
        n_x_chars += 1
    if not pw_set & set(ascii_uppercase):
        n_x_chars += 1
    if not pw_set & set("0123456789"):
        n_x_chars += 1
    if not pw_set & set("!@#$%^&*()-+"):
        n_x_chars += 1
    n_x_chars += max(6 - n - n_x_chars, 0)
    
    return n_x_chars
if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)