#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
vector<int> out;
int lis(int arr[], int n)
{
    int lis[n];
    lis[0] = 1;
    for (int i = 1; i < n; i++) {
        lis[i] = 1;
        for (int j = 0; j < i; j++)
            if (arr[i] > arr[j] && lis[i] < lis[j] + 1){

                lis[i] = lis[j] + 1;}
                out.push_back(lis[i-1]);


    }
    out.push_back(lis[n-1]);
    return *max_element(lis, lis + n);
}

int main()
{

    int n;
    fin >> n;
    int arr[n];
    for(int i = 0; i < n; i++)
    {
        fin >> arr[i];
    }
    int ccout = lis(arr, n);
    fout << ccout << '\n';
    vector<int> ord;
    int current = 1, pos = 0;

    while(pos < n)
    {
        if(out[pos] > out[pos+current])
        {
            current++;
        }
        else if(out[pos] == out[pos+current])
        {
            pos++;
            current = 1;
        }
        else //if(out[pos]+1 == out[pos+current])
        {

            ord.push_back(pos);
            pos += current;
            current = 1;

        }

    }
    for(int i = 0; i < ccout; i++)
    {
        fout << arr[ord[i]] << ' ';
    }
    return 0;
}