#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[100002],i,n,b[100002],a[100002],dr,st,m,sol,k,nr=0,poz,c[100002];
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    k=0;
    for(i=1;i<=n;i++)
    {
        st=1;
        dr=k;sol=0;
        while(st<=dr)
        {
            m=(st+dr)/2;
            if(v[i]>a[m])
                st=m+1;
            else
            {
                sol=m;
                dr=m-1;
            }
        }
        if(sol==0)
        {
            k++;
            a[k]=v[i];
            b[i]=k;
            poz=i;
        }
        else
        {
            a[sol]=v[i];
            b[i]=sol;
        }

    }
    fout<<k<<'\n';

    for(i=poz;i>=1&&k>0;i--)
    {
        if(b[i]==k)
            {
                nr++;
                c[nr]=v[i];
                k--;
            }

    }
    for(i=nr;i>=1;i--)
        fout<<c[i]<<" ";

    return 0;
}