#include<bits/stdc++.h>
using namespace std;
int N,M,x;
int op;
int arr[100001];
int lis[100001];
int prev[100001];
int maxi,indexi;
vector<int>sol;
int main()
{
    //freopen("scmax.in","r",stdin);
   // freopen("scmax.out","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
cin>>N;
for(int i=0;i<N;i++)
cin>>arr[i];

    for(int i=1;i<N;i++)
    for(int j=0;j<i;j++)
    if(arr[j]<arr[i] && lis[i]<lis[j]+1){
    lis[i]=lis[j]+1;
    prev[i]=j;
    if(lis[i]>maxi)
    maxi=lis[i],indexi=i;
}
//cout<<maxi<<" \n";
    while(indexi!=0)
    {sol.push_back(arr[indexi]);
        index=prev[indexi];
    }
    cout<<maxi+1<<"\n";
    for(int i=sol.size()-1;i>=0;i--)
    cout<<sol[i]<<" ";
    return 0;
}