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

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

int a[100005], d[100005], n, poz[100005], k;
int st[100005], top;

int CautBin(int x)
{
    int st = 1, dr = k, mij = 0, p = k;
    while(st <= dr)
    {
        mij = (st + dr)/2;
        if(x <= d[mij])
        {
            p = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    return p;
}
int main()
{
    int i, j, p;
    in >> n;
    for(i = 1; i <= n; i++)
        in >> a[i];
    k = 1;
    poz[1] = 1;
    d[1] = a[1];
    for(i = 2; i <= n; i++)
    {
        if(d[1] >= a[i])
        {
            d[1] = a[i];
            poz[i] = 1;
        }
        else if(d[k] < a[i])
        {
            d[++k] = a[i];
            poz[i] = k;
        }
        else
        {
            p = CautBin(a[i]);
            d[p] = a[i];
            poz[i] = p;
        }
    }
    out << k << "\n";
    for(i = n; i >= 1 and k > 0; i--)
        if(poz[i] == k)
        {
            st[++top] = a[i];
            k--;
        }
    for(i = top; i >= 1; i--)
        out << st[i] << " ";
    return 0;
}