#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 free1 freopen("input.txt", "r", stdin)
	#define free2 freopen("output.txt", "w", stdout)
	#define mp make_pair
	#define pb push_back
	#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


	int main() 
	{
		IOS;

    int n;
    cin>>n;
    string s;
    cin>>s;
    string s1="0123456789";
    string s2="abcdefghijklmnopqrstuvwxyz";
    string s4="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string s3="!@#$%^&*()-+";
    int count=0;
    int t=0;
    for(int i=0;i<s.length();i++)
    {
        for(int j=0;j<s1.length();j++)
            if(s[i]==s1[j])
            {
                t++;
                break;
            }
    }
    if(t==0)
        count++;
    trace1(count);
    t=0;
    for(int i=0;i<s.length();i++)
    {
        for(int j=0;j<s2.length();j++)
            if(s[i]==s2[j])
            {
                t++;
                break;
            }
    }
    if(t==0)
        count++;
   trace1(count);
    
   t=0;
    for(int i=0;i<s.length();i++)
    {
        for(int j=0;j<s3.length();j++)
            if(s[i]==s3[j])
            {
                t++;
                break;
            }
    }
    if(!t)
        count++;
   trace1(count);
     t=0;
    for(int i=0;i<s.length();i++)
    {
        for(int j=0;j<s4.length();j++)
            if(s[i]==s4[j])
            {
                t++;
                break;
            }
    }
    if(!t)
        count++;trace1(count);
    trace1(count);
    if(count+n<6)
        count+=(6-count-n);
    cout<<count;
    return 0;
}