#include <fstream>
#define nmax 100001
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int dp[nmax],t[nmax],v[nmax],k,n;
void rec(int i){
    if(i==0)
        return ;
    rec(t[i]);
    cout<<v[i]<<" ";
}
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>v[i];
        int st=1,dr=k,p=0;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(v[dp[mid]]>=v[i])
                p=mid,dr=mid-1;
            else
                st=mid+1;
        }
        if(p==0)
            t[i]=dp[k],dp[++k]=i;
        else
            t[i]=dp[p-1],dp[p]=i;
    }
    cout<<k<<'\n';
    rec(dp[k]);
    return 0;
}