#include <fstream>
#include <iostream>
#define MAX 100001

using namespace std;

int v[MAX], T[MAX];
int main()
{
    int n, i, j,st, dr, mij, length = 0, gasit;

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

    fin >> n;

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

    length = 1;
    T[1] = 1;
    for(i = 2; i <= n; i++)
    {
        st = 1;
        dr = length;

        gasit = -1;
        while(st <= dr)
        {
            mij = (st + dr) / 2;

            if(v[i] < v[T[mij]])
            {
                gasit = mij;
                dr = mij - 1;
            }
            else st = mij + 1;
        }

        if(gasit == -1 && v[i] > v[T[length]])
        {
            length++;
            T[length] = i;
        }
        else if(v[T[gasit - 1]] < v[i]) T[gasit] = i;
    }

    fout << length << endl;
    for(i = 1; i <= length; i++)fout << v[T[i]] << " ";

    fin.close();
    fout.close();

    return 0;
}