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

public class Main {
    static ArrayList<Word> words = new ArrayList<>();
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        while (n-- > 0) {
            Word tmp = new Word(sc.next());
            if (tmp.isGood()) {
                words.add(tmp);
            }
        }
        Collections.sort(words);
        dp = new int[words.size()][26];
        for (int[] arr : dp) {
            Arrays.fill(arr, -1);
        }
        System.out.println(dfw(words.size() - 1, 25));
    }
    
    static int dfw(int idx, int c) {
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][c] < 0) {
            Word current = words.get(idx);
            if (current.right <= c) {
                dp[idx][c] = Math.max(dfw(idx - 1, c), dfw(idx - 1, current.left) + current.length());
            } else {
                dp[idx][c] = dfw(idx - 1, c);
            }
        }
        return dp[idx][c];
    }
    
    static class Word implements Comparable<Word> {
        String name;
        int left;
        int right;
        boolean good;
        
        public Word(String name) {
            this.name = name;
            char prev = 'a';
            good = true;
            for (char c : name.toCharArray()) {
                if (prev > c) {
                    good = false;
                    break;
                }
                prev = c;
            }
            left = name.charAt(0) - 'a';
            right = prev - 'a';
        }
        
        public int compareTo(Word another) {
            if (right == another.right) {
                return left - another.left;
            } else {
                return right - another.right;
            }
        }
        
        public int length() {
            return name.length();
        }
        
        public boolean isGood() {
            return good;
        }
    }
}

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 double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}