/*
ID: Sho10
LANG: C++
TASK:
*/
#include <bits/stdc++.h> //JuniorMonster a.k.a Sho10
#define ll long long int
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define sz size
#define f first
#define s second
#define pb push_back
#define er erase
#define in insert
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000000007
#define PI 3.14159265359
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n,ans=0,a[100005],dp[100005],pos[100005];
vector<ll>v;
int32_t main(){
CODE_START;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
cin>>n;
for(ll i=0;i<n;i++)
{
    cin>>a[i];
    pos[i]=-1;
}
dp[0]=0;
for(ll i=0;i<n;i++)
{
    dp[i]=1;
    for(ll j=0;j<i;j++)
    if(a[j]<a[i]&&dp[j]+1>dp[i]){
        dp[i]=dp[j]+1;
        pos[i]=j;
    }
}
ll s1=0;
for(ll i=0;i<n;i++)
{
    if(ans<dp[i]){
        ans=dp[i];
        s1=i;
    }
}
cout<<ans<<endl;
while(1!=0){
        if(pos[s1]==-1){
                v.pb(a[s1]);
            break;
        }else {
        v.pb(a[s1]);
        s1=pos[s1];
        }
}
reverse(v.begin(),v.end());
for(ll i=0;i<v.size();i++)
    cout<<v[i]<<' ';
}