# include <fstream>
# define DIM 100010
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int d[DIM],t[DIM],v[DIM],Marcat[DIM],vec[DIM],n,x,i,j,step,sol,nr;
int main () {
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>v[i];
        for(step=1;step<=sol;step*=2);
        for(j=0;step;step/=2)
            if(j+step<=sol&&v[d[j+step]]<v[i])
                j+=step;
        d[j+1]=i;
        t[i]=d[j];
        if(j==sol)
            sol++;
    }
    fout<<sol<<"\n";
    for(i=n;i>=1;i--){
        if(!Marcat[i]){
            j=i;
            nr=0;
            while(j!=0){
                Marcat[j]=1;
                vec[++nr]=v[j];
                j=t[j];
            }
            if(nr==sol){
                for(i=sol;i>=1;i--)
                    fout<<vec[i]<<" ";
                return 0;
            }
        }
    }
    return 0;
}