using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = SList(n);
        var dic = new List<string>[26];
        for (var i = 0; i < dic.Length; ++i) dic[i] = new List<string>();
        var same = new int[26];
        foreach (var si in s)
        {
            var flg = true;
            for (var i = 0; i + 1 < si.Length; ++i)
            {
                if (si[i] > si[i + 1])
                {
                    flg = false;
                    break;
                }
            }
            if (flg)
            {
                if (si[0] == si[^1]) same[si[0] - 'a'] += si.Length;
                else dic[si[0] - 'a'].Add(si);
            }
        }
        var dp = new int[27];
        for (var i = 0; i + 1 < dp.Length; ++i)
        {
            dp[i] += same[i];
            dp[i + 1] = Math.Max(dp[i + 1], dp[i]);
            foreach (var si in dic[i])
            {
                dp[si[^1] - 'a'] = Math.Max(dp[si[^1] - 'a'], dp[i] + si.Length);
            }
        }
        WriteLine(dp[^1]);
    }
}