#include <cstdio>

using namespace std;
int n,i,j,k,v[100010],a[100010];
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]);
    v[1]=a[n];
    k=1;
    for(i=n-1;i>=1;i--)
        for(j=k;j>=1;j--)
        if(a[i]<v[j])
        {
            j++;
            v[j]=a[i];
            if(j>k)k=j;
            break;
        }
    printf("%d\n",k);
    for(k=k;k>0;k--)
        printf("%d ",v[k]);
    return 0;
}