//horatiu11
# include <cstdio>
# define nmax 100001
using namespace std;
int n,a[nmax],sol[nmax],L[nmax];
int main()
{
    int i,l,r,m,poz,k,j;
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;++i)
        scanf("%d",&a[i]);
    k=0;sol[0]=0;
    for(i=1;i<=n;++i)
    {
        if(a[i]>sol[k])sol[++k]=a[i],L[i]=k;
        else
        {
            l=1;r=k;poz=k;
            while(l<=r)
            {
                m=(l+r)/2;
                if(sol[m]<a[i])l=m+1;
                else poz=m,r=m-1;
            }
            sol[poz]=a[i];
            L[i]=poz;
        }
    }
    printf("%d\n", k);
    for(i=n,j=0;i>0&&k;--i)
        if(L[i]==k)sol[++j]=a[i],--k;
    for(i=j;i>0;--i)
        printf("%d ",sol[i]);
    printf("\n");
    return 0;
}