# include <cstdio>
# define nmax 100003
using namespace std;
int N, a[nmax], sol[nmax], L[nmax];
int i, l, r, m, poz, k,j;
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]);
    printf("\n");
    return 0;
}