#include<bits/stdc++.h>
#define ll long long
#define sz size
#define pb push_back
#define er erase
#define in insert
#define fr first
#define sc second
#define mp make_pair
#define pi pair
#define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
#define rc(s) return cout<<s,0
using namespace std;

int n,x,par[100005];
map<int,int>pop;
vector<int>ans;

int binsearch(int l,int r,int y){
    int mid;
     while(l<=r){
        mid=l+(r-l)/2;
        if(ans[mid]<y) l=mid+1;
        else r=mid-1;
     }
     mid=l+(r-l)/2;
     if(ans[mid]>=y) mid--;
     return mid;


}

void afis(int y){
    if(pop[y]>=1) afis(pop[y]);
    cout<<y<<' ';

}

signed main(){
//    freopen("scmax.in","r",stdin);
//    freopen("scmax.out","w",stdout);
    pop[1]=0;
    cin >> n;
    cin >> x;
    n--;
    ans.pb(x);
    while(n--){
        cin >> x;
        if(!ans.size()){ ans.push_back(x); continue;}
        if(x>ans[ans.size()-1]){ pop[x]=ans[ans.size()-1]; ans.pb(x);  continue;}
        int ho=binsearch(0,ans.size()-1,x);
        ans[ho+1]=x;
        pop[x]=ans[ho];
    }

    cout<<ans.size()<<endl;
    afis(ans[ans.size()-1]);
}