#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    int hasDigit = 1, hasLower = 1, hasUpper = 1, hasSpecial = 1;
    string sp = "!@#$%^&*()-+";
    for(auto iter : password) {
        if('0' <= iter && iter <= '9') hasDigit = 0;
        if('a' <= iter && iter <= 'z') hasLower = 0;
        if('A' <= iter && iter <= 'Z') hasUpper = 0;
        if(sp.find(iter) != string::npos) hasSpecial = 0;
        if(!hasDigit && !hasLower && !hasUpper && !hasSpecial) break;
    }
    int result = hasDigit + hasLower + hasUpper + hasSpecial;
    int len = n + result;
    if(len < 6) result += (6-len);
    
    return result;
}

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