#!/bin/python3

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    numbers = "0123456789"
    lower_case = "abcdefghijklmnopqrstuvwxyz"
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    special_characters = "!@#$%^&*()-+"
    sum1 = 0
    if n < 6:
        for i in password:
            if i in numbers:
                break
        else:
            sum1 += 1
        for i in password:
            if i in lower_case:
                break
        else:
            sum1 += 1    
        for i in password:
            if i in upper_case:
                break
        else:
            sum1 += 1 
        for i in password:
            if i in special_characters:
                break
        else:
            sum1 += 1    
        if sum1+n < 6:
            return (sum1 + (6-(sum1+n)))
        else:
            return(sum1)
    else:
        for i in password:
            if i in numbers:
                break
        else:
            sum1 += 1
        for i in password:
            if i in lower_case:
                break
        else:
            sum1 += 1    
        for i in password:
            if i in upper_case:
                break
        else:
            sum1 += 1 
        for i in password:
            if i in special_characters:
                break
        else:
            sum1 += 1    
        return (sum1)
        
if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)