#!/bin/python3

import sys

def minimumNumber(n, password):
    special_characters = "!@#$%^&*()-+"
    num=0
    low=0
    upp=0
    spe=0
    result=0
    for i in password:
        if i.isdigit():
            num+=1
        elif i.islower():
            low+=1
        elif i.isupper():
            upp+=1
        elif i in special_characters:
            spe+=1
    if num==0:
        result+=1
        n+=1
    if low==0:
        result+=1
        n+=1
    if upp==0:
        result+=1
        n+=1
    if spe==0:
        result+=1
        n+=1
    if n<6:
        result+=(6-n)
    return result

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