#!/bin/python3

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    if(n==0):
        return 6
    if(n==1):
        return 5
    if(n==2):
        return 4
    add=0
    if(not any(x.isupper() for x in password)):
        add+=1
    if(not any(x.islower() for x in password)):
        add+=1
    if(not any(x.isdigit() for x in password)):
        add+=1
    s = "!@#$%^&*()-+"
    flag=False
    for i in s:
        if(i in password):
            flag=True
            break
    if(flag==False):
        add+=1
    total = add + n
    if(total>=6):
        return add
    else:
        return add+(6-total)

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