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

class Program
{
    static string ReadLine()
    { 
        return Console.ReadLine().Trim();
    }

    static void Main()
    {
        int N = int.Parse(ReadLine());
        int[] A = ReadLine().Split().Select(_ => int.Parse(_)).ToArray();
        int[] B = ReadLine().Split().Select(_ => int.Parse(_)).ToArray();

        A = A.OrderBy(_ => _).ToArray();
        B = B.OrderBy(_ => _).ToArray();

        Stack<int> stack = new Stack<int>();
        long sum = 0;
        for (int i = N - 1; i >= 1; i--)
        {
            int v = Math.Abs(A[i] - B[i - 1]);
            stack.Push(v);
            sum += v;
        }

        //Console.WriteLine($"{A[0]} を外して {sum}");
        List<Pair> pairs = new List<Pair>();
        pairs.Add(new Pair(A[0], sum));

        for (int i = 0; i < N - 1; i++)
        {
            int v = Math.Abs(A[i] - B[i]);
            sum -= stack.Pop();
            sum += v;
            pairs.Add(new Pair(A[i + 1], sum));
            //Console.WriteLine($"{A[i + 1]} を外して {sum}");
        }

        long min = pairs.Min(_ => _.Sum);
        int[] rets = pairs.Where(_ => _.Sum == min).Select(_ => _.Value).Distinct().OrderBy(_ => _).ToArray();

        Console.WriteLine(rets.Length);
        Console.WriteLine(string.Join(" ", rets));
    }
}

class Pair
{
    public Pair(int value, long sum)
    {
        Value = value;
        Sum = sum;
    }
    public int Value = 0;
    public long Sum = 0;
}