#include <bits/stdc++.h>
#define MOD (1000000007LL)
#define INF (1000000007LL)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define fo(i, n) for (ll i = 0; i < (ll)(n); ++i)
#define fr(i, n) for (ll i = 1; i <= (ll)(n); ++i)
#define all(x) (x).begin(), (x).end()

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> ii;
typedef pair<ll, ii> iii;

ll pwr(ll base, ll p, ll mod = MOD){
ll ans = 1;while(p){if(p&1)ans=(ans*base)%mod;base=(base*base)%mod;p/=2;}return ans;}
ll gcd(ll a, ll b) {
  if(b == 0)  return a;
  return gcd(b, a%b);
}
ll nCr(ll n, ll r) {
  ll C[r+1]; memset(C, 0, sizeof(C)); C[0] = 1;
  for (ll i = 1;i <= n;i++) for (ll j = min(i, r); j > 0; j--)
    C[j] = C[j] + C[j-1];
  return C[r];
}
ll M(ll a) {return (a % MOD);}
bool isPowerOfTwo (ll x) {return x && (!(x&(x-1)));}
typedef vector<int> VI;
typedef vector<ll> VLL;
typedef vector<VI> VVI;
typedef vector<VLL> VVLL;
typedef vector<ii> VPLL;
//==============================================================================

int main() {
    int n; cin >> n;
    string s; cin >> s;
    if(n < 6) {
        int x = 4;
        for(char c:s) {
            if(c <= 'z' && c >= 'a') {
                //cout << "1c = " << c << endl;
        //cout << "x = " << x << endl;
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c <= 'Z' && c >= 'A') {
                //cout << "2c = " << c << endl;
                //cout << "x = " << x << endl;
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c >= '0' && c <= '9') {
                //cout << "3c = " << c << endl;
        //cout << "x = " << x << endl;
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c == '!' || c == '@' || c == '#' || c == '$' || c == '%'|| c == '^' || c == '&' || c == '*' || c == '(' || c == ')' || c == '-' || c == '+') {
                //cout << "4c = " << c << endl;
        //cout << "x = " << x << endl;
                x--;
                break;
            }
        }
        //cout << "x = " << x << endl;
        if(x + n >= 6) {
            cout << x;
            return 0;
        }
        else {
            cout << (6 - n);
        }
    }
    else {
        int x = 4;
        for(char c:s) {
            if(c <= 'z' && c >= 'a') {
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c <= 'Z' && c >= 'A') {
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c >= '0' && c <= '9') {
                x--;
                break;
            }
        }
        for(char c:s) {
            if(c == '!' || c == '@' || c == '#' || c == '$' || c == '%' || c == '^' || c == '&' || c == '*' || c == '(' || c == ')' || c == '-' || c == '+') {
                x--;
                break;
            }
        }
        cout << x;
    }
    return 0;
}