#include <cstdio>
#define DIM 100010
using namespace std;
FILE*f=fopen("scmax.in", "r");
FILE*g=fopen("scmax.out", "w");
int n, m, i, v[DIM], a[DIM], b[DIM], p, u, nr;

void afisare(int x){
    if(x)
    {
        afisare(a[x]);
        fprintf(g, "%d ", v[x]);
    }
}

int main(){
    fscanf(f, "%d", &n);
    for(i=1; i<=n; i++)
        fscanf(f, "%d", &v[i]);
    b[1]=1;
    nr=1;
    for(i=2; i<=n; i++)
    {
        p=1;
        u=nr;
        while(p<=u)
        {
            m=p+(u-p)/2;
            if(v[i]>v[ b[m] ])
                p=m+1;
            else
                u=m-1;
        }
        if(p>nr)
            nr++;
        b[p]=i;
        a[i]=b[p-1];
    }
    fprintf(g, "%d\n", nr);
    afisare(b[nr]);
    return 0;
}