#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string pass) {
    // Return the minimum number of characters to make the password strong
    string num = "0123456789";
    string low = "abcdefghijklmnopqrstuvwxyz";
    string up = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string sp = "!@#$%^&*()-+";
    int number=0,lower=0,upper=0,special=0,count=0;
   
    for (int i = 0; i < pass.length(); i++)
    {
        if (num.find(pass[i]) != std::string::npos)
            number++;
        if(low.find(pass[i]) != std::string::npos)
            lower++;
        if(up.find(pass[i]) != std::string::npos)
            upper++;
        if(sp.find(pass[i]) != std::string::npos)
            special++;
    }
    if(number==0) count++;
    if(upper==0) count++;
    if(lower==0) count++;
    if(special==0) count++;
    
    if(count+n<6)
        count=count+(6-count-n);
    return count;
    
}

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