3ta

using System;
using System.Collections.Generic;
using System.Linq;

namespace Second
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var list = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var list2 = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var lcs = LCS(list, list2);
            var res = BackTrack(lcs, list, list2, list.Length, list2.Length).TrimStart(); //out
            var result = res.Split().Select(int.Parse).ToArray();
            Console.WriteLine(String.Join(" ", result));
            Console.WriteLine(result.Length);
        }

        static int[,] LCS(int[] s1, int[] s2)
        {
            int[,] c = new int[s1.Length + 1, s2.Length + 1];
            for (int i = 1; i <= s1.Length; i++)
                for (int j = 1; j <= s2.Length; j++)
                {
                    if (s1[i - 1] == s2[j - 1])
                        c[i, j] = c[i - 1, j - 1] + 1;
                    else
                        c[i, j] = c[i - 1, j] > c[i, j - 1] ? c[i - 1, j] : c[i, j - 1];
                }
            return c;
        }

        static string BackTrack(int[,] c, int[] s1, int[] s2, int i, int j)
        {
            if (i == 0 || j == 0)
                return "";
            else if (s1[i - 1] == s2[j - 1])
                return BackTrack(c, s1, s2, i - 1, j - 1) + " " + s1[i - 1];
            else if (c[i, j - 1] > c[i - 1, j])
                return BackTrack(c, s1, s2, i, j - 1);
            else
                return BackTrack(c, s1, s2, i - 1, j);
        }
    }
}