#include <bits/stdc++.h>
#include<regex>

using namespace std;

int minimumNumber(int n, string password)
{
    // Return the minimum number of characters to make the password strong
    
   int count = 0;
    bool islower = false,isupper = false,isNumber = false,isSpecial = false;
    
    for(int i = 0; i < password.length();i++)
    {
        if(password[i] >= 65 && password[i] <= 90 )
        {
            islower = true;
            break;
        } 
    }
    
    
     for(int i = 0; i < password.length();i++)
    {
        if(password[i] >= 97 && password[i] <= 122 )
        {
            isupper = true;
            break;
        } 
    }
    
     for(int i = 0; i < password.length();i++)
    {
        if(password[i] >= 48 && password[i] <= 57 )
        {
            isNumber = true;
            break;
        } 
    }
    
    
     for(int i = 0; i < password.length();i++)
    {
        if(password[i] == '!' || password[i] == '@' || password[i] == '#' || password[i] == '$' || password[i] == '%' || password[i] == '^' || password[i] == '&' || password[i] == '*' || password[i] == '(' || password[i] == ')' || password[i] == '-' || password[i] == '+' )
        {
            isSpecial = true;
            break;
        } 
    }
    
    
    if(!islower)
        count++;
    
    if(!isupper)
           count++;
    
    if(!isNumber)
        count++;
    
    if(!isSpecial)
        count++;
    
    if((password.length() + count) < 6)
    {
        int rem = 6 - (password.length() + count);
        count = count + rem;
    }
    
    return count;
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}