#!/bin/python

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    d,u,l,sp=1,1,1,1
    for i in password:
        if i.isdigit():
            d=0
        if i.isupper():
            u=0
        if i.islower():
            l=0
        if i=='!' or i=='@' or i=='#' or i=='$' or i=='%' or i=='^' or i=='&' or i=='*' or i=='(' or i==')' or i=='-' or i=='+' :
            sp=0
    count = d+u+l+sp
    if count+n<6:
        count+=(6-count-n)
    return count

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