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

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

int main(void){
    register int i,j,p,u,mid;

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