#include <bits/stdc++.h>

using namespace std;
bool equal(char a, string &b)
{
    for(int i = 0;i<b.size();i++)
    {
        if(b[i] == a)
        {
            return true;
        }
    }
    return false;
}
int check(string &a, string &b)
{
    for(int i = 0;i<a.size();i++)
    {
        if(equal(a[i],b))
        {
            return 0;
        }
    }
    return 1;
}
int minimumNumber(int n, string password) {
    int ans = 0;
    string numbers = "0123456789";
    string lcase = "abcdefghijklmnopqrstuvwxyz";
    string ucase  = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special =  "!@#$%^&*()-+";
    int num = check(password,numbers);
    int lower = check(password,lcase);
    int upper = check(password, ucase);
    int spec = check(password,special);
    ans = num+lower+upper+spec;
    if(n<6)
    {
        ans = max(ans,6-n);
    }
    return ans;
    
}

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