#include <bits/stdc++.h>
using namespace std;
#define mod                1000000007
#define ll                 int 
#define all(v)             v.begin(), v.end()
#define fr(n)              for(ll i=0;i<n;++i)
#define ctz(x)             __builtin_ctzll(x)
#define clz(x)             __builtin_clzll(x)
#define pcount(x)          __builtin_popcountll(x)
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
 #define cin fin
 #define cout fout
 ifstream fin("scmax.in");
 ofstream fout("scmax.out");
 
 

void solve(){
    ll n;cin>>n;
    ll a[n+1];
    a[0]=0;
    for(ll i=1; i<=n; i++){
    	cin>>a[i];
	}
	vector<ll> dp(n+1, 0);
	ll temp=0;
	vector<ll> p(n+1, 0);
	ll tempp;
	for(ll i=1; i<=n;i++){
		for(ll j=i-1; j>=0;j--){
			if(a[j]<a[i] && dp[i]<dp[j]+1) {
				dp[i]=dp[j]+1;
				p[i]=j;
			}
		}
		if(temp<dp[i]){
			temp=dp[i];
			tempp=i;
		}
	}
	cout<<temp<<"\n";
	ll cnt=INT_MAX;
	while(tempp!=0){
		cout<<a[tempp]<<" ";
		tempp=p[i];
	}
	
}
 
 
int main(){
//   ios_base::sync_with_stdio(false); cin.tie(NULL);
//   ll t;cin>>t;while(t--){solve();cout<<endl;}
	solve();
}