#include <fstream>

using namespace std;

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

struct lista{int val, id;};

lista sh[100005];

int n, last, a[100005], pre[100005], x, N[100005], nr;

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