#include<cstdio>
#include<algorithm>
#define oo 2000000000+10
#define NMAX 100000+5
using namespace std;
int a[NMAX],t[NMAX],p[NMAX],i,j,n,sol,x;
void write(int x)
{
    if(p[x]==0) {printf("%d ",a[x]); return;}
    write(p[x]);
    printf("%d ",a[x]);
}
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]);
        t[i]=oo;
        j=(int)(lower_bound(t+1,t+i+1,a[i])-t);
        t[j]=a[i];
        p[i]=(j==1)?0:j;
        if(sol<j) {sol=j; x=i;}
    }
    printf("%d\n",sol);
    write(x);
    return 0;
}