#!/bin/python3

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    a=0
    b=0
    for i in password:
        if(i.isdigit()==True):
            b=1
    if(b==0):
        a+=1
    b=0    
    for i in password:
        if(i.islower()==True):
            b=1
    if(b==0):
        a+=1
    b=0
    for i in password:
        if(i.isupper()==True):
            b=1
    if(b==0):
        a+=1
    b=0
    for i in password:
        if(i=='#' or i=='+' or i=='-' or i=='(' or i==')' or i=='$' or i=='!' or i=='@' or i=='%' or i=='^' or i=='&' or i=='*' ):
            b=1
    if(b==0):
        a+=1
    if(n+a>=6):
        return(a)
    else:
        return(6-n)

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