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

int x;
string s;
string a[] = {
"0123456789",
"abcdefghijklmnopqrstuvwxyz",
"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"!@#$%^&*()-+"
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> s >> s;
    for(string y : a)
        for(int i = 0 ; i < y.size() ; i++)
            if(count(s.begin(), s.end(), y[i])){
                x++;
                break;
            }
    int n = s.size();
    n += 4-x;
    cout << max(0, 6-n)+4-x << endl;
    return 0;
}