#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double K;
typedef pair<int, int> pii;

#define x first
#define y second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()

const int inf = 2000000000;

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

int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(0);
    int n;
    string s;
    cin >> n >> s;

    int dig = 1, slet = 1, blet = 1, ss = 1;
    for(int i = 0; i < s.length(); i++){
        if(s[i] >= '0' && s[i] <= '9'){
            dig = 0;
        }
        if(s[i] >= 'a' && s[i] <= 'z'){
            slet = 0;
        }
        if(s[i] >= 'A' && s[i] <= 'Z'){
            blet = 0;
        }
        for(int j = 0; ss && j < t.length(); j++){
            if(s[i] == t[j]){
                ss = 0;
                break;
            }
        }
    }

    cout << max(6 - n, dig + slet + blet + ss);
}