#!/bin/python

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    no=0
    if any([c for c in password if c.islower()])==False:
        no+=1
        password+="a"
    if any([c for c in password if c.isupper()])==False:
        no+=1
        password+="A"
    if any([c for c in password if c.isdigit()])==False:
        no+=1
        password+="1"
    if any([c for c in password if c in "!@#$%^&*()-+"])==False:
        no+=1
        password+="1"
    if n+no>=6 :
        return no
    else :
        return no+(6-(no+n))
     

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