#include <bits/stdc++.h>

using namespace std;

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

const long long dim = (long long) (1e5) + 1;
const long long oo = (long long) (1e18);

long long n, v[dim], dp[dim], idx[dim], urm[dim], poz, l;

void cauta(long long x)
{
    long long st = 1 << 16;
    poz = 0;
    for(; st; st>>=1)
        if(poz + st <= l && v[idx[poz + st]] < x)
            poz += st;
}

void afis(int p)
{
    if(p == 0)
        return;
    afis(urm[p]);
    out<<v[p]<<' ';
}


int main()
{
    in>>n;
    l = 0;
    for(long long i = 1; i <= n; i++)
    {
        in>>v[i];
        idx[i] = 0;
        v[0] = oo;
    }
    for(long long i = 1;i <= n;i++)
    {
        cauta(v[i]);
        dp[i] = poz + 1;
        if(v[i] < v[idx[poz + 1]])
            idx[poz + 1] = i;
        urm[i] = idx[poz];
        l = max(l, poz + 1);

    }
    out<<l<<'\n';
    for(int i = 1;i <= n;i++)
    {
        if(dp[i] == l)
        {
            afis(i);
            break;
        }
    }
    return 0;
}