#include<cstdio>

using namespace std;

int n,a[100003],sol[100003],L[100003];
int il,l,r,m,poz,k,j,i;

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]);

    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]);

    return 0;
}