#include <bits/stdc++.h>
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

const int NMAX = 1e5+5;
int n, arr[NMAX], dp[NMAX], idx[NMAX], pos[NMAX];

int main()
{
    fin >> n;
    for(int i = 1; i <= n; ++ i)
        fin >> arr[i];
    int k = 1;
    dp[1] = arr[1];
    for(int i = 2; i <= n; ++ i)
    {
        if(dp[k] < arr[i])
            dp[++k] = arr[i], pos[i] = k;
        else
        {
            int st = 1, dr = k, poz = k + 1;
            while(st <= dr)
            {
                int mid = (st + dr) / 2;
                if(dp[mid] >= arr[i])
                    dr = mid -1, poz = mid;
                else
                    st = mid + 1;
            }
            dp[poz] = arr[i];
            pos[i] = poz;
        }
    }
    fout << k << '\n';
    int j = n;
    for(int i = k; i >= 1; -- i)
    {
        while(pos[j]!=i)
            j--;
        idx[i] = j;
    }
    for(int i = 1; i <= k; ++ i)
        fout << arr[idx[i]] << ' ';
}