#!/bin/python3

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    a = list(password)
    b = ["!","@","#","$","%","^","&","*","(",")","-","+"]
    if any(x.isupper() for x in a):
        upper = 0
    else:
        upper = 1
    if any(x.islower() for x in a):
        lower = 0
    else:
        lower = 1
    if any(x.isdigit() for x in a):
        number = 0
    else:
        number =1
    ctr = 1
    for i in a:
        if i in b:
            ctr = 0
            break
            
    if len(a)>=6:
        leng = 0
    else:
        leng = max(6-upper-lower-number-ctr-len(a),0)
    return leng+upper+lower+number+ctr

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