#!/bin/python3

import sys
import re


def minimumNumber(n, password):
    a,b,c,d,e=1,1,1,1,0
    numbers = "0123456789"
    lower_case = "abcdefghijklmnopqrstuvwxyz"
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    special_characters = "!@#$%^&*()-+"
    for k in password:
        if(k  in numbers):
            a=0
        if(k  in lower_case):
            b=0
        if(k  in upper_case):
            c=0
        if(k  in special_characters):
            d=0
    if(a+b+c+d+n<6):
        e=6-(a+b+c+d+n)
    return a+b+c+d+e


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