#include <bits/stdc++.h>
using namespace std;

#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define endl "\n"
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define int long long

#define trace1(x)                cerr<<#x<<": "<<x<<endl
#define trace2(x, y)             cerr<<#x<<": "<<x<<" | "<<#y<<": "<<y<<endl
#define trace3(x, y, z)          cerr<<#x<<":" <<x<<" | "<<#y<<": "<<y<<" | "<<#z<<": "<<z<<endl
#define trace4(a, b, c, d)       cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<endl
#define trace5(a, b, c, d, e)    cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<endl
#define trace6(a, b, c, d, e, f) cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<" | "<<#f<<": "<<f<<endl

template<typename T> T gcd(T a,T b) { if(a==0) return b; return gcd(b%a,a); }
template<typename T> T pow(T a,T b, long long m){T ans=1; while(b>0){ if(b%2==1) ans=(ans*a)%m; b/=2; a=(a*a)%m; } return ans%m; }

const int N=1e5+5;

int32_t main()
{
    IOS;
    int n;
    cin>>n;
    string s;
    cin>>s;
    int ans=0;
    int check=0;
    for(auto it:s)
    {
        if(it<='z'&&it>='a')
            check=1;
    }
    if(!check)
        ans++;
    check=0;
    for(auto it:s)
    {
        if(it>='A'&&it<='Z')
            check=1;
    }
    if(!check)
        ans++;
    check=0;
    for(auto it:s)
    {
        if(it<='9'&&it>='0')
            check=1;
    }
    if(!check)
        ans++;
    check=0;
    string special="!@#$%^&*()-+";
    for(auto it:s)
    {
        if(special.find(it)!=string::npos)
            check=1;
    }
    if(!check)
        ans++;
    ans=max(ans, 6-n);
    cout<<ans;
    return 0;
}