using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace zad2_ps3
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] slowoA = new char[256];
            char[] slowoB = new char[256];
         //      string text;
         //string[] rozdzielonyText;
         //   int dlugosc;
         //int[] tablica;
        List <char> list = new List<char>();

            StreamWriter sw = new StreamWriter("out.txt");

            //using (FileStream fs = File.OpenRead("in.txt"))
            //{
            //    StreamReader sr = new StreamReader(fs);
            //    text = sr.ReadLine();
            //    rozdzielonyText = text.Split();
            //    dlugosc = rozdzielonyText.Length;
            //    tablica = new int[dlugosc];

            //    for (int i = 0; i < dlugosc; i++)
            //    {
            //        tablica[i] = Convert.ToInt32(rozdzielonyText[i]);

            //    }
            //}




            if (slowoA.Length>slowoB.Length)
            {
                for(int i=0; i<slowoA.Length;i++)
                {
                    for (int j = 0; j < slowoB.Length; j++)
                    {
                        if (slowoA[i] == slowoB[j])
                        {
                            list.Add(slowoA[i]);
                            slowoA[i] = ('0');
                            slowoB[j] = ('0');
                        }
                    }
                }
            }
            else for (int i = 0; i < slowoB.Length; i++)
                {
                    for (int j = 0; j < slowoA.Length; j++)
                    {
                        if (slowoB[i] == slowoA[j])
                        {
                            list.Add(slowoB[i]);
                            slowoA[i] = ('0');
                            slowoB[j] = ('0');
                        }
                    }
                }
            sw.Write(list);

            sw.Close();

        }
    }
}