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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
    
    class Program
    {
        static void Main(string[] args)
        {
            int n= int.Parse(System.Console.ReadLine());
            System.String target = System.Console.ReadLine();
            System.String[] tarray = target.Trim().Split(' ');
            System.String temp = "";
            System.Int32 count = 0;
            int incount = 0;
            foreach(string ele in tarray)
            {
                temp = ele;
                foreach(string sle in tarray)
                {
                    if(dup(temp,sle)==false)
                    {
                        incount++;
                        temp = temp + sle;
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