#include<bits/stdc++.h>
using namespace std;
#define mxx 105
#define pii pair<int, int>
#define MP make_pair
#define inf 1000000
#define ss second
#define ff first
#define DEBUG(x) cout << #x <<": " << x << endl


string special_characters = "!@#$%^&*()-+";

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

    string s;
    cin >> s;

    int cnt = 0;
    for(int i = 0; i < s.size(); i++){
        if(s[i] >= '0' && s[i] <= '9'){
            cnt++;
            break;
        }
    }

    for(int i = 0;i < s.size(); i++){
        if(s[i] >= 'a' && s[i] <= 'z'){
            cnt++;
            break;
        }
    }

    for(int i = 0; i < s.size(); i++){
            //cout << i << " " <<  s[i] << " " << uppercase[i] << endl;
        if(s[i] >= 'A' && s[i] <= 'Z'){
            cnt++;
            break;
        }
    }
    int flag = 0;
    for(int i = 0; i <  special_characters.size(); i++){
       for(int j = 0; j < s.size(); j++){
        if(s[j] ==  special_characters[i]){
            cnt++;
            flag = 1;
            break;
        }
       }
       if(flag)
        break;
    }
    //DEBUG(cnt);
    //cout << cnt << endl;

    int res = 4 - cnt;

    int dif = 6 - (n + res);
    if(dif > 0)
        res += dif;

    cout << res << endl;
}