#!/bin/python3

import sys
import math

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    lower_case="a b c d e f g h i j k l m n o p q r s t u v w x y z"
    upper_case = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
    special = "! @ # $ % ^ & * ( ) - +"
    total=0;
    if( not any(char.isdigit() for char in password)):
        total+=1
    if (not any(char in list(special.split(" ")) for char in password)):
        total+=1
    if (not any(char in list(upper_case.split(" ")) for char in password)):
        total+=1
    if (not any(char in list(lower_case.split(" ")) for char in password)):
        total+=1
    if(n<6):
        total+= max(6-n-total,0)
    return total
    

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