#include <cstdio>

using namespace std;

int n,i,a[100000],l[100000],j,max,poz,nr,poz2;

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]);
    l[n+1]==1;
    for(i=n; i>=1; i--)
    {
        l[i]=1;
        for(j=i+1; j<=n; j++)
        if(a[i]<a[j]) {l[i]=l[j]+1;break;}
    }
    max=0;
    for(i=1; i<=n; i++) if(l[i]>max) {max=l[i];poz=i;}
    printf("%d\n",max);
    printf("%d ",a[poz]);
    for(i=max-1;i>0;i--){
    nr=0;poz=poz2;
    for(j=poz;j<=n;j++) if(l[j]==i && a[j]>nr) {nr=a[j];poz2=j;}
    printf("%d ",nr);
    }
    return 0;
}