#include <bits/stdc++.h>

using namespace std;

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

const int NMAX(100005);
int v[NMAX], scm[NMAX], nr, in[NMAX], sol[NMAX];

void adauga(int val, int poz){
    if(val > scm[nr]){
        scm[++nr] = val;
        in[poz] = nr;
        return;
    }
    int step = 1, best = 0;
    for(; step <= nr; step <<= 1);
    for(; step; step >>= 1)
        if(best + step <= nr && scm[best + step] < val)
            best += step;
    ++best;
    scm[best] = val;
    in[poz] = best;
}

int main()
{
    int n;
    fin >> n;

    for(int i = 1; i <= n; ++i)
        fin >> v[i];

    for(int i = 1; i <= n; ++i)
        adauga(v[i], i);

    int p = n;
    for(int i = nr; i >= 1; --i){
        while(in[p] != i)
            p--;
        sol[i] = p;
    }

    fout << nr << '\n';
    for(int i = 1; i <= nr; ++i)
        fout << v[sol[i]] << ' ';
    return 0;
}