#include<fstream>
#define DIM 100005
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[DIM],w[DIM],n,nr,dr,st,mid;
int main(){
    fin >> n;
    for( int i = 1; i <= n; i++ ){
        fin >> v[i];
    }
    nr = 1;
    w[1] = 1;
    for( int i = 1; i <= n; i++ ){
        if( v[ w[nr] ] < v[i] ){
            w[++nr]= i;
        }else{
            st = 1;
            dr = nr;
            while( st <= dr ){
                mid = ( st + dr ) / 2;
                if( v[ w[mid] ] < v[i] ){
                    st = mid + 1;
                }else{
                    dr = mid - 1;
                }
            }
            if( v[ w[dr] ] < v[i] ){
                nr = dr;
                w[ ++nr ] = i;
            }
        }
    }
    fout << nr << "\n";
    for( int i = 1; i <= nr; i++ ){
        fout << v[ w[i] ] << " ";
    }
    return 0;
}