#include<fstream>
using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int v[100001], x[100001], n, pred[100001], m;

int caut(int val)
{
    int j=0, pas=1<<16;
    while(pas!=0)
    {
        if(v[x[j+pas]]<val && j+pas<=m)
            j+=pas;
        pas/=2;
    }
    return j;
}

void funct(int i)
{
    if(pred[i]>0)
        funct(pred[i]);
    g<<v[i]<<" ";
}

int main()
{
    int i,j;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    x[++m]=1;
    for(i=2;i<=n;i++)
    {
        j=caut(v[i]);
        pred[i] = x[j];
        x[j+1] = i;
        if(j+1>m)
            m++;
    }
    g<<m<<"\n";
    funct(x[m]);
    return 0;
}