#include<fstream>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int v[200001],poz[200001],d[200001],ans[200001];
int n,b,l,maxim,maxim2,i;
int cb(int x, int dr)
{
    int st=1, anscb=0, mid;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(v[poz[mid]]<x)
        {
            anscb=mid;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    return anscb;
}
int main()
{
    in>>n;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
    }
    for(i=1; i<=n; i++)
    {
        b=cb(v[i],l);
        l=max(l,b+1);
        d[i]=b+1;
        poz[d[i]]=i;
        maxim=max(maxim,d[i]);
    }
    maxim2=maxim;
    out<<maxim<<'\n';
    for(i=n; i>=1; i--)
    {
        if(maxim2==d[i])
        {
            ans[maxim2]=v[i];
            maxim2--;
        }
    }
    for(i=1; i<=maxim; i++)
    {
        out<<ans[i]<<" ";
    }
    return 0;
}