import java.io.*;
import java.util.*;

public class Main {
    static ArrayList<String> list = new ArrayList<>();
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        for (int i = 0; i < n; i++) {
            String s = sc.next();
            if (check(s)) {
                list.add(s);
            }
        }
        Collections.sort(list, new Comparator<String>() {
            public int compare(String s1, String s2) {
                if (s1.charAt(s1.length() - 1) == s2.charAt(s2.length() - 1)) {
                    return s1.charAt(0) - s2.charAt(0);
                } else {
                    return s1.charAt(s1.length() - 1) - s2.charAt(s2.length() - 1);
                }
            }
        });
        dp = new int[list.size()][26];
        System.out.println(dfw(list.size() - 1, 25));
    }
    
    static boolean check(String s) {
        char start = 'a';
        for (char c : s.toCharArray()) {
            if (c < start) {
                return false;
            }
            start = c;
        }
        return true;
    }
    
    static int dfw(int idx, int alpha) {
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][alpha] == 0) {
            String s = list.get(idx);
            if (s.charAt(s.length() - 1) - 'a' > alpha) {
                dp[idx][alpha] = dfw(idx - 1, alpha);
            } else {
                dp[idx][alpha] = Math.max(dfw(idx - 1, alpha), dfw(idx - 1, s.charAt(0) - 'a') + s.length());
            }
        }
        return dp[idx][alpha];
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}