#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int i,j,n,x,v[100005],l;
int main()
{
    f>>n;
    for (i=1;i<=n;++i)
        {
            f>>x;
            for (j=1;j<=l;++j)
                if (v[j]>=x)
                    {
                        v[j]=x;
                        break;
                    }
            if (j==l+1)
                {
                    v[++l]=x;
                }
        }
    g<<l<<'\n';
    for (i=1;i<=l;++i)
        g<<v[i]<<" ";
    return 0;
}