import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    static List<MyWord> list;
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        list = IntStream.range(0, n).mapToObj(i -> new MyWord(sc.next())).sorted().toList();
        dp = new int[n][26];
        for (int[] arr : dp) {
            Arrays.fill(arr, -1);
        }
        System.out.println(dfw(n - 1, 25));
    }
    
    static int dfw(int idx, int v) {
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][v] < 0) {
            if (v < list.get(idx).right) {
                dp[idx][v] = dfw(idx - 1, v);
            } else {
                dp[idx][v] = Math.max(dfw(idx - 1, v), dfw(idx - 1, list.get(idx).left) + list.get(idx).value);
            }
        }
        return dp[idx][v];
    }
    
    static class MyWord implements Comparable<MyWord> {
        int left;
        int right;
        int value;
        
        public MyWord(int left, int right, int value) {
            this.left = left;
            this.right = right;
            this.value = value;
        }
        
        public MyWord(String s) {
            this(s.charAt(0) - 'a', s.charAt(s.length() - 1) - 'a', isGood(s) ? s.length() : 0);
        }
        
        public int compareTo(MyWord another) {
            if (right == another.right) {
                return left - another.left;
            } else {
                return right - another.right;
            }
        }
        
        private static boolean isGood(String s) {
            return IntStream.range(0, s.length() - 1).allMatch(i -> s.charAt(i) <= s.charAt(i + 1));
        }
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}