#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    string spec = "!@#$%^&*()-+";
    bool len = false, number = false, lo = false, up = false, sp = false;
    if(password.length() >= 6) len = true;
    for(int i = 0; i < password.length(); i++){
        if(password[i] - 'a' <= 25 && password[i] - 'a' >= 0) {
            lo = true;
            continue;
        }
        if(password[i] - 'A' <= 25 && password[i] - 'A' >= 0) {
            up = true;
            continue;
        }
        if(password[i] - '0' <= 9 && password[i] - '0' >= 0) {
            number = true;
            continue;
        }
        size_t found = spec.find(password[i]);
        if(found != string::npos) {
            sp = true;
            continue;
        }
        
    }
    int count = 0;
    if(!lo) {
        count++;
    }
    if(!up) {
        count++;
    }
    if(!number) {
        count++;
    }
    if(!sp) {
        count++;
    }
    if(password.length() + count < 6) count += (6 - password.length() - count);
    return count;
    
    
}

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