#!/bin/python3

import sys

def minimumNumber(n, password):
    numbers = "0123456789"
    lower_case = "abcdefghijklmnopqrstuvwxyz"
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    special_characters = "!@#$%^&*()-+"
    answer = 0
    if all(c not in numbers for c in password):
        answer += 1
    if all(c not in lower_case for c in password):
        answer += 1
    if all(c not in upper_case for c in password):
        answer += 1
    if all(c not in special_characters for c in password):
        answer += 1
    answer += max(0, 6 - n - answer)
    return answer
        
        

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