#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[100002],r[100002],t[100002],st,dr,k,i,mij,n;
void reconstituire(int x)
{
    if(x!=0)
    {
        reconstituire((r[x]));
        fout<<v[x]<<" ";
    }
}
int main()
{
    fin>>n;
    for(i=1;i<=n;++i)
        fin>>v[i];
    for(i=1;i<=n;++i)
    {
        st=1,dr=k;
        while(st<=dr)
        {
            mij=(st+dr)/2;
            if(v[t[mij]]<v[i]) st=mij+1;
            else dr=mij-1;
        }
        t[st]=i;
        if(st>k) k=st;
        r[i]=t[st-1];
    }
    fout<<k<<"\n";
    reconstituire(t[k]);
    return 0;
}