# include <cstdio>

using namespace std;

int L, p, ct1, a[100005], M[100005], Best[100005], prev[100005], rez[100005];
int cautbin(int val, int st, int dr)
{int mij, poz;
     
     while (st <= dr)
     {
           mij = (st + dr) / 2;
           if (a[M[mij]] < val) st = mij + 1, poz = mij;
                         else dr = mij - 1; 
           }
           
     return poz;
}

int main()
{int poz = 0, n, i;
    
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    
    scanf("%d",&n);
    for (i = 1; i <= n; i++)
        scanf("%d",&a[i]);
        
    M[1] = 1;
    Best[1] = 1;
    for (i = 2; i <= n; i++)
    {
        poz = cautbin(a[i],0,L);
        Best[i] = poz + 1;
        M[poz + 1] = i;
        prev[i] = M[poz];
        if (L < poz + 1) L = poz + 1, p = i;
        }
        
    printf("%d\n",L);
    while (p) rez[++ct1] = a[p], p = prev[p];
    
    for (i = ct1; i >= 1; i--)
        printf("%d ",rez[i]);
        
return 0;
}