#include <bits/stdc++.h>

typedef long long ll;
using namespace std;

bool tem(char c){
    string s = "!@#$%^&*()-+";
    for (int i = 0; i < s.size(); i++) if (s[i] == c) return true;
    return false;
}
int main(){
    int n;
    string s;
    cin >> n;
    cin >> s;

    int q = 0;
    bool a = 0, b = 0, c = 0, d = 0;
    for (int i = 0; i < s.size(); i++){
        if (isdigit(s[i])) a= true;
        if (islower(s[i])) b= true;
        if (isupper(s[i])) c= true;
        if (tem(s[i])) d = true;
    }
    q = !a + !b + !c + !d;
    int ans = max (6 - n, q);
    cout << ans << endl;
    return 0;
}