#pragma GCC optimize("O3") 
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx") 
#define __USE_MINGW_ANSI_STDIO 0
#include<bits/stdc++.h>                               
using namespace std;

#define dbg(x) cerr << #x << " == " << x << "\n";
#define PI acos(-1)
#define pb push_back
#define fi first
#define se second
#define TASK ""
#define sz(a) (int)(a).size()
#define all(c) (c).begin(), (c).end()
#define TIMESTAMP fprintf(stderr, "Execution time: %.3lf s.\n", (double)clock()/CLOCKS_PER_SEC)

string to_string(string s) {
    return '"' + s + '"';
}

string to_string(const char* s) {
    return to_string((string) s);
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
    return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A>
string to_string(A v) {
    bool first = true;
    string res = "{";
    for (const auto &x : v) {
        if (!first) {
            res += ", ";
        }
        first = false;
        res += to_string(x);
    }
    res += "}";
    return res;
}

void debug_out() { cerr << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << to_string(H);
    debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair <int, int> pii;
typedef vector <vi> vvi;
typedef vector <pii> vpii;
typedef vector <string> vs;
	
const int MAXN = 1e5 + 9;
const int MOD = (int)(1e9 + 7);
const int LOG2MAXN = 17;
const int INF = 1e9;
const ld eps = 1e-9;

int di[] = {0, 1, 0, -1};
int dj[] = {1, 0, -1, 0};
char ddir[] = {'R', 'U', 'L', 'D'};

mt19937_64 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());

void solve() {
	
}

void input() {
	string s;
	int n;
	cin >> n >> s;
	string special = "!@#$%^&*()-+";
	bool lower = 0, upper = 0, digit = 0, sp = 0;
	for(auto x : s) {
		if(x >= 'a' && x <= 'z') lower = 1;
		if(x >= 'A' && x <= 'Z') upper = 1;
		if(x >= '0' && x <= '9') digit = 1;
		for(auto y : special)
			if(y == x)
				sp = 1;
	}
	int len = sz(s) + (int)!lower + (int)!upper + (int)!sp + (int)!digit;
	debug(len);
	cout << ((int)!lower + (int)!upper + (int) !sp + (int)!digit) + max(0, 6 - len) << endl;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
#ifdef LOCAL
	freopen("xxx.in", "r", stdin);
	freopen("xxx.out", "w", stdout);
#else
	//freopen(TASK".in", "r", stdin);
	//freopen(TASK".out", "w", stdout);
#endif	
	input();
	solve();
#ifdef LOCAL
	TIMESTAMP;
#endif	
	return 0;
}