#include <cstdio>

using namespace std;
int v[100005],vmin[100005],m,pred[100005],pmin[100005],n;
int caut(int x)
{
    int r=0,pas=1<<17;
    while(pas)
    {
        if(r+pas<=m&&v[pmin[r+pas]]<x)
            r+=pas;
        pas/=2;
    }
    return r;
}
int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    int i,j;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    m=0;
    for(i=1;i<=n;i++)
    {
        j=caut(v[i]);
        vmin[j+1]=v[i];
        pmin[j+1]=i;
        if(j==m)
            m++;
        pred[i]=pmin[j];
    }
    printf("%d\n",m);
    for(i=1;i<=m;i++)
        printf("%d ",vmin[i]);
}