import java.io.*;
import java.util.*;
import java.math.*;
import java.util.concurrent.*;

public final class hour_rank_a
{
    static BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
	static FastScanner sc=new FastScanner(br);
    static PrintWriter out=new PrintWriter(System.out);
	static Random rnd=new Random();
	
    public static void main(String args[]) throws Exception
    {
		int n=sc.nextInt();char[] a=sc.next().toCharArray();
		
		boolean now=false;
		
		for(int i=0;i<n;i++)
		{
			if(Character.isDigit(a[i]))
			{
				now=true;
			}
		}
		
		int res=0;
		
		if(!now)
		{
			res++;
		}
		
		now=false;
		
		for(int i=0;i<n;i++)
		{
			if(a[i]>=65 && a[i]<=91)
			{
				now=true;
			}
		}
		
		if(!now)
		{
			res++;
		}
		
		now=false;
		
		for(int i=0;i<n;i++)
		{
			if(a[i]>=97 && a[i]<=122)
			{
				now=true;
			}
		}
		
		if(!now)
		{
			res++;
		}
		
		now=false;
		
		for(int i=0;i<n;i++)
		{
			if(!Character.isDigit(a[i]) && !Character.isLetter(a[i]))
			{
				now=true;
			}
		}
		
		if(!now)
		{
			res++;
		}
		
		int ans=res+Math.max(0,6-(n+res));
		
		out.println(ans);out.close();
    }
}
class FastScanner
{
    BufferedReader in;
    StringTokenizer st;

    public FastScanner(BufferedReader in) {
        this.in = in;
    }
	
    public String nextToken() throws Exception {
        while (st == null || !st.hasMoreTokens()) {
            st = new StringTokenizer(in.readLine());
        }
        return st.nextToken();
    }
	
	public String next() throws Exception {
		return nextToken().toString();
	}
	
    public int nextInt() throws Exception {
        return Integer.parseInt(nextToken());
    }

    public long nextLong() throws Exception {
        return Long.parseLong(nextToken());
    }

    public double nextDouble() throws Exception {
        return Double.parseDouble(nextToken());
    }
}