import java.util.*;
import java.io.*;
class StrongPassword {
static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    static StringTokenizer st = null;
    
    static String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }
    
    static int nextInt() {
        return Integer.parseInt(next());
    }
    
    static long nextLong() {
        return Long.parseLong(next());
    }
 
    public static void main(String args[]) {
        try {
                int n=nextInt();
                String s=next();
                String sp="!@#$%^&*()-+";
                int a=0,b=0,c=0,d=0;
                for(int i=0;i<s.length();i++)
                {
                    char ch=s.charAt(i);
                    if(ch>='0' && ch<='9')
                        a=1;
                    if(ch>='a' && ch<='z')
                        b=1;
                    if(ch>='A' && ch<='Z')
                        c=1;
                    if(sp.indexOf(ch)!=-1)
                        d=1;
                }
                int count=0;
                if(a==0)
                    count++;
                if(b==0)
                    count++;
                if(c==0)
                    count++;
                if(d==0)
                    count++;
                int p=n+count;
                if(p<6)
                    System.out.println(6-p+count);
                else
                    System.out.println(count);
            bw.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}