#!/bin/ruby

def minimumNumber(n, password)
    i = 0
    special_characters = "!@#$%^&*()-+"
    
    i+=1 unless password =~ /[A-Z]/
    i+=1 unless password =~ /[a-z]/
    i+=1 unless password =~ /[0-9]/
    
    
    f = 0
    special_characters.split('').each do |e|
        if(password.include?(e))
            f = 1
            break
        end
    end
    
    i+=1 if f == 0
    

    
    if(i + n < 6)
        t = 6 - i - n
        i+t
    else
        i
    end

end

n = gets.strip.to_i
password = gets.strip
answer = minimumNumber(n, password)
puts answer