#!/bin/python3

import sys

def minimumNumber(n, password):
    numbers = "0123456789"
    lower_case = "abcdefghijklmnopqrstuvwxyz"
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    special_characters = "!@#$%^&*()-+"
    chklist=0
    flag=True
    for item in password:
        if item in numbers:
            flag=False
            break
    if(flag==True):
        chklist+=1
    flag=True    
    for item in password:
        if item in lower_case:
            flag=False
            break
    if(flag==True):
        chklist+=1
        
    flag=True    
    for item in password:
        if item in upper_case:
            flag=False
            break
    if(flag==True):
        chklist+=1
        
    flag=True    
    for item in password:
        if item in special_characters:
            flag=False
            break
    if(flag==True):
        chklist+=1    
    
    if(n+chklist<6):
        chklist+=6-(n+chklist)
        
    return chklist
            

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