#include <fstream>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int n,x,v[100002],m;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>x;
        int st=1,dr=m,poz=0;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(v[mid]>=x){
                poz=mid;
                dr=mid-1;
            }else
                st=mid+1;
        }
        if(poz==0)
            v[++m]=x;
        else
            v[poz]=x;
    }
    cout<<m<<'\n';
    for(int i=1;i<=m;i++)
        cout<<v[i]<<" ";
    return 0;
}