<?php

$handle = fopen ("php://stdin", "r");

function minimumNumber($password) {
    $rules = [
        "0123456789" => 1,
        "abcdefghijklmnopqrstuvwxyz" => 1,
        "ABCDEFGHIJKLMNOPQRSTUVWXYZ" => 1,
        "!@#$%^&*()-+" => 1,
    ];
    
    $strong_length = 6;
    $min_req = 0;
    
    foreach ($rules as $rule_key => $rule_val) {
        $q = 0;
        for ($i=0; $i<strlen($password); $i++) {
            if (strpos($rule_key, $password[$i])!==false) {
                ++$q;
            }
        }
        
        if ($q<$rule_val) {
            $min_req += $rule_val - $q;
        }
    }
    
    if ($min_req + strlen($password) < $strong_length) {
        $min_req += $strong_length - ($min_req + strlen($password));
    }
    
    return $min_req;
}

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