<?php

$handle = fopen ("php://stdin", "r");
function minimumNumber($n, $password) {
    // Return the minimum number of characters to make the password strong
    $k = 0;
    $numbers = array("0","1","2","3","4","5","6","7","8","9");
    $lower_case = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
    $special_characters = array("!","@","#","$","%","^","&","*","(",")","-","+");
    $flag = 0;
        foreach($lower_case as $key =>$char){
            if(strpos($password,$char) !== FALSE){
                $flag = 1;
                break;
            }
        }
        //echo $char." - ".$flag."\n";
        if($flag == 0){
            $k++;
        }
        $flag = 0;
        foreach($lower_case as $key =>$char){
            if(strpos($password,strtoupper($char)) !== FALSE){
                $flag = 1;
                break;
            }
        }
        //echo strtoupper($char)." - ".$flag."\n";
        if($flag == 0){
            $k++;
        }
        $flag = 0;
        foreach($numbers as $key =>$num){
            if(strpos($password,$num) !== FALSE){
                $flag = 1;
                break;
            }
        }
        //echo $num." - ".$flag."\n";
        if($flag == 0){
            $k++;
        }
        $flag = 0;
        foreach($special_characters as $key =>$char){
            if(strpos($password,$char) !== FALSE){
                $flag = 1;
                break;
            }
        }
        if($flag == 0){
            $k++;
        }
    if(($n + $k) < 6){
        $k += (6 - $n - $k);
    }
    return $k;
}

fscanf($handle, "%i",$n);
fscanf($handle, "%s",$password);
$answer = minimumNumber($n, $password);
echo $answer . "\n";

?>