#!/bin/python3

import sys

def minimumNumber(n, password):
    digits=list("0123456789")
    lower_case = list("abcdefghijklmnopqrstuvwxyz")
    upper_case = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
    special_characters = list("!@#$%^&*()-+") 
    flagdigit=0
    flower=0
    fupper=0
    fspecial=0
    for ch in password:
        if ch in digits:
            flagdigit=1
        elif ch in lower_case:
            flower=1
        elif ch in upper_case:
            fupper=1
        elif ch in special_characters:
            fspecial=1
        if (4-flagdigit-flower-fupper-fspecial)==0:
            break
    length=n+4-flagdigit-flower-fupper-fspecial
    if length<6:
        return 6-n
    else:
        return length-n
    # Return the minimum number of characters to make the password strong

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