#include <bits/stdc++.h>
using namespace std;

int minimumNumber(int n, string password)
{
    int len = password.size();
    string special = "!@#$%^&*()-+";
    int len2 = special.size();

    int digit = 0, lc = 0, uc = 0, sc = 0;

    for(int i = 0; i < len; i++){
        if(password[i] >= '0' && password[i] <= '9')
            digit++;
        else if(password[i] >= 'a' && password[i] <= 'z')
            lc++;
        else if(password[i] >= 'A' && password[i] <= 'Z')
            uc++;
        for(int j = 0; j < len2; j++){
            if(password[i] == special[j]){
                sc++;
            }
        }
    }

    int count = 0;

    if(lc == 0)     count++;
    if(sc == 0)     count++;
    if(uc == 0)     count++;
    if(digit == 0)  count++;

    if(len < 6){
        if(count + len >= 6){
            return count;
        }
        else{
            int temp = count + (6 - (count + len));
            return temp;
        }
    }
    else
        return count;
}

int main()
{
    int n;
    cin>>n;

    string password;
    cin>>password;

    int answer = minimumNumber(n, password);
    cout<<answer<<endl;

    return 0;
}