#include <bits/stdc++.h>

#define forn(i,n) for(int i = 0; i < (n); i++)
#define forsn(i,s,n) for(int i = (s); i < (n); i++)
#define sq(x) ((x) * (x))
#define all(v) ((v).begin, (v).end)
#define x real()
#define y imag()
#define pb push_back
#define f first
#define s second
#define mp make_pair

using namespace std;

typedef long long int tint;
typedef pair<int,int> par;

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

int main() {
    int n;
    cin >> n;
    string pass;
    cin >> pass;
    int ans = 0;
    int mis = max(6 - n, 0);
    int m = spec.size();
    bool dig  = false;
    forn(i,n)
    {
        if(pass[i] >= '0' and pass[i] <= '9') dig = true;
    }
    bool lo = false;
    forn(i,n)
    {
        if(pass[i] >= 'a' and pass[i] <= 'z') lo = true;
    }
    bool u = false;
    forn(i,n)
    {
        if(pass[i] >= 'A' and pass[i] <= 'Z') u = true;
    }
    bool spe = false;
    forn(i,n)
    {
        forn(j,m)
        {
            if(pass[i] == spec[j]) spe = true;
        }
    }
    if(!dig) ans++;
    if(!lo) ans++;
    if(!u) ans++;
    if(!spe) ans++;
    
    ans = max(ans, mis);
    
    cout << ans << endl;
    
    return 0;
}