#include <fstream>
using namespace std;
const int Vmax = 100001;
int a[Vmax], minVal[Vmax], pre[Vmax];
int n, lMax;

void inbetween(int st, int dr, int x){
    if(st==dr){
        if(x <= minVal[st]){
            pre[x] = (st > 0) ? minVal[st - 1] : 0;
            minVal[st] = x;
        }
        else{
            pre[x] = minVal[st];
            minVal[st+1] = x;
        }
        return;
    }
    int mij = (st+dr)/2;
    if(x <= minVal[mij])
        return inbetween(st, mij, x);
    else    
        return inbetween(mij+1, dr, x);
}

int main(){
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>a[i];
    for(int i=1;i<=n;i++){
        if(minVal[lMax] < a[i]){
            pre[a[i]] = minVal[lMax];
            lMax++;
            minVal[lMax] = a[i];
        }
        else
            inbetween(1, lMax, a[i]);
    }
    fout<<lMax<<'\n';
    int sol[Vmax];
    int precedentul=minVal[lMax];
    for(int i=lMax;i>=1;i--){
        sol[i] = precedentul;
        precedentul = pre[precedentul];
    }
    for(int i=1;i<=lMax;i++)
        fout<<sol[i]<<" ";
}