#include <cstdio>
using namespace std;
int i,n,stiv[100001],a[100001],pos[100001],m,cm,xx[100001];
int bin(int m,int x,int stiv[])
{
    int poz=0,mij,st,dr;
    st=1;
    dr=m;
    while (st<=dr&&!poz)
    {
        mij=(st+dr)/2;
        if (stiv[mij]>x)dr=mij-1;
        else if (stiv[mij]<x) st=mij+1;
        else poz=mij;
    }
    if (poz==0)return st;
    else return poz;
}
int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    scanf("%d",&n);
    for (i=1; i<=n; i++)
        scanf("%d",&a[i]);
    stiv[1]=a[1];
    pos[1]=1;
    m=1;
    for (i=2; i<=n; i++)
    {
        stiv[bin(m,a[i],stiv)]=a[i];
        if (bin(m,a[i],stiv)>m)m++;
        pos[i]=bin(m,a[i],stiv);
    }
    printf("%d\n",m);
    cm=m;
    for (i=n; i>=1&&cm!=0; i--)
    {
        if (pos[i]==cm)
        {
            xx[cm]=a[i];
            cm--;
        }
    }
    for (i=1; i<=m; i++)
        printf("%d ",xx[i]);
    return 0;
}