#include <cstdio>
#define inf 2000000000
using namespace std;

int a[100003],n,p[100003],q[100003],s[100003];
int len;

void citire()
{
    scanf("%d",&n);
    for(int i=0;i<n;i++)
        scanf("%d",&a[i]);
}

int inserare(int v)
{
    int st=0;
    int dr=len;
    while(st<=dr )
    {
        int m=(st+dr)/2;
        if(v<q[m])
            dr=m-1;
        else
           if(v>q[m])
            st=m+1;
            else
            {
                st=m;
                break;
            }
    }
    q[st]=v;
    if(st>len)
        len++;
    return st;
}

void constr()
{
    q[0]=a[0];
    p[0]=0;
    for(int i=1;i<n;i++)
          p[i]=inserare(a[i]);

}

void afis(int i,int lg)
{
    if(lg>=0)
        if(p[i]==lg)
    {
        afis(i-1,lg-1);
        printf("%d ",a[i]);
    }
    else
            afis(i-1,lg);
}


int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    citire();
    constr();
    printf("%d\n",len+1);
    afis(n-1,len);
    return 0;
}