#include <fstream>
#include <algorithm>
#define DIM 100011
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,m,a[DIM],c[DIM],T[DIM];


void afisare(int x){
    if(T[x])
        afisare(T[x]);
    g<<a[x]<<" ";
}

int main(void){
    register int i,j,x,p,u,nr=0,mid;

    f>>n;
    for(i=1;i<=n;i++) f>>a[i];

    m=1,c[1]=1;
    for(i=2;i<=n;i++){
        p=1,u=m;
        while(p<=u){
            mid=p+(u-p)/2;
            if(a[c[mid]]>=a[i])
                u=mid-1;
            else
                p=mid+1;
        }
        if(p>m)
            m++,c[p]=i,T[i]=c[p-1];
        else
            if(a[c[p]]>a[i])
                c[p]=i,T[i]=c[p-1];
    }
    g<<m<<"\n";
    afisare(c[m]);
    f.close();
    g.close();
    return 0;
}