//////////////////////////////////////////
/* ************************************ */
/*    @@@@@      X     X       @@@@@    */
/*   @     @	  X   X       @     @   */
/*  @  @@@@ @ 	   X X       @  @@@@ @  */
/* @  @   @  @      X       @  @   @  @ */
/*  @  @@@ @@      X X       @  @@@ @@  */
/*   @            X   X       @         */
/*    @@@@@      X     X       @@@@@    */
/* ************************************ */
//////////////////////////////////////////

//Tayyorgarchilik
#include <bits/stdc++.h>
#include <stdlib.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
#define AXA true
#define ishkal_tugadi 0
#define ishkal_boshlandi main
#define PB push_back
#define MP make_pair
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) (int((x.size())))
#define pii pair<int,int>
#define ft first
#define sd second
#define vi vector <int>
#define si set <int>
#define db(x) cerr<<#x<<" = "<<x<<endl;
#define R(i,a,n) for (ll i=a; i<=n; i++)
#define RALL(i,a) for (auto i:a)
#define L(i,n,a) for (ll i=n; i>=a; i--)
#define standart 1
ll gcd(ll a, ll b){
	return b?gcd(b,a%b):a;
}
ll lcm(ll a, ll b){
	return a*(b/gcd(a,b));
}
string sum(string a, string b){
    string ans="";
    R(i,0,max(SZ(a),SZ(b)))ans+='0';
	reverse(ALL(a));
    reverse(ALL(b));
    while (SZ(a)>SZ(b))b+='0';
    while (SZ(a)<SZ(b))a+='0';
    R(i,0,SZ(a)-1){
        int temp=int(ans[i]-'0');
        temp+=(a[i]-'0');
        temp+=(b[i]-'0');
        int j=0;
        while (temp>0){
            ans[i+j]=char((temp%10)+'0');
            temp/=10;
            j++;
        }
    }
    reverse (ALL(ans));
    while (ans[0]=='0' && SZ(ans)>1)ans.erase(0,1);
    return ans;
}
bool prime(ll x){
    if (x==0)return 1;
    R(i,2,sqrt(x)){
        if (x%i==0)return 0;
    }
    return 1;
}
bool palindrom(string s){
	string ss="";
	R(i,0,s.size()-1)ss=s[i]+ss;
	return ss==s;
}



bool a,b,c,d;
int ishkal_boshlandi(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(!standart){
        freopen("INPUT.TXT", "r", stdin);
        freopen("OUTPUT.TXT", "w", stdout);
    }
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    int z;
    cin>>z;
    string s;
    cin>>s;
    int n=4;
    R(i,0,SZ(s)-1){
        if (!a && numbers.find(s[i])!=-1){
            a=true;
            n--;
        }
        if (!b && lower_case.find(s[i])!=-1){
            b=true;
            n--;
        }
        if (!c && upper_case.find(s[i])!=-1){
            c=true;
            n--;
        }
        if (!d && special_characters.find(s[i])!=-1){
            d=true;
            n--;
        }
    }
    if ((SZ(s)+n)<6)n+=(6-(SZ(s)+n));
    cout<<n;

	return ishkal_tugadi;
}