#include <fstream>

using namespace std;
ifstream f ("scmax.in");
ofstream g ("scmax.out");
int n,i,a[100002],st[100002],l[100002],poz,vf,Max,pMax,vfsol,sol[100002];
int cautbin (int k,int val)
{
    int sta=1,dr=k,mij,poz=0;
    while (sta<=dr)
    {
        mij=(sta+dr)/2;
        if (st[mij]<val) sta=mij+1;
        else if (st[mij]>val)
        {
            dr=mij-1;
            poz=mij;
        }
        else
        {
            poz=mij;
            break;
        }
    }
    return poz;
}
int main()
{
    f>>n;
    for (i=1;i<=n;i++)
    {
        f>>a[i];
    }
    vf=0;
    for (i=1;i<=n;i++)
    {
        poz=cautbin(vf,a[i]);
        if(poz==0)
        {
            vf++;
            st[vf]=a[i];
            poz=vf;
        }
        else st[poz]=a[i];
        l[i]=poz;
        if (l[i]>Max)
        {
            pMax=i;
            Max=l[i];
        }
    }
    g<<Max<<'\n';
    vfsol=1;
    sol[1]=a[pMax];
    Max--;
    for (i=pMax-1;i>=1;i--)
    {
        if (l[i]==Max && a[i]<sol[vfsol])
        {
            vfsol++;
            sol[vfsol]=a[i];
            Max--;
        }
    }
    for (i=vfsol;i>=1;i--) g<<sol[i]<<" ";
    return 0;
}