#include <fstream>

using namespace std;

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

int n, last, a[100005], sh[100005], N[100005];

int main()
{
    int i, j, k;
    fin>>n;
    for (i=1; i<=n; i++)
    {
        fin>>a[i];
    }
    last=1;
    sh[1]=a[1];
    for (i=2; i<=n; i++)
    {
        for (j=last; j>=0; j--)
        {
            if (a[i]>sh[j])
            {
                if (a[i]<sh[j+1] || sh[j+1]==0)
                {
                    sh[j+1]=a[i];
                    if (j+1>last)
                    {
                        last=j+1;
                        for (k=1; k<=last; k++)
                            N[k]=sh[k];
                    }
                }
                break;
            }
        }
    }
    fout<<last<<'\n';
    for (i=1; i<=last; i++)
    {
        fout<<N[i]<<" ";
    }
    return 0;
}