#include <iostream>
#include <fstream>

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

int val_min[100001], n, x[100001], lung[100001], pmax;

void refac_subsir(int p, int l, int val){
    if(p == 0)
        return;
    if(lung[p] == l && x[p] < val){
        refac_subsir(p-1, l-1, x[p]);
        fout << x[p] <<' ';
    }
    else
        refac_subsir(p-1, l, val);
}

int caut_bin(int v[], int n, int val){
    ///caut cel mai mare i cu v[i] < val
    int st = 1, dr = n, rez = 0;
    while(st <= dr){
        int m = (st + dr) / 2;
        if(v[m] < val){
            rez = m;
            st = m + 1;
        }
        else{
            dr = m-1;
        }
    }
    return rez;
}

int main()
{
    fin >> n;
    for(int i = 1; i <= n; i++)
        fin >> x[i];

    int n_val_min = 0;
    for(int i = 1; i <= n; i++){
        int j0 = caut_bin(val_min, n_val_min, x[i]);
        if(j0 == n_val_min){
            n_val_min ++;
        }
        lung[i] = 1 + j0;
        val_min[1 + j0] = x[i];
        if(lung[i] > lung[pmax])pmax = i;
    }
    fout<< lung[pmax] << endl;

    refac_subsir(pmax, lung[pmax], x[pmax+1]);

    return 0;
}