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

char numbers[] = "0123456789";
char lower_case[] = "abcdefghijklmnopqrstuvwxyz";
char upper_case[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char special_characters[] = "!@#$%^&*()-+";

int minimumNumber(int n, string password) {
    
  
    bool num,lc,uc,sc;
    num = lc = uc = sc = 1;
    int sol = 0;
  
    for(int i=0;i<password.length();i++)
    {
        char c = password[i];
        if(strchr(numbers, c))
            num = 0;
        
        if(strchr(lower_case, c))
            lc = 0;
        
        if(strchr(upper_case, c))
            uc = 0;
        
        if(strchr(special_characters, c))
            sc = 0;
    }
    
    sol = sol + num + lc + uc + sc;
    
    if(password.length() + sol < 6)
        sol = 6 - password.length();
    
    return sol;
}

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