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#include <fstream>
#include <iostream>
#include <stack>
#include <algorithm>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[100002];
int t[100002];
int r[100002];
int lmax=0;
int temp[100002];
int n;
int main()
{
fin >> n;
for(int i=0; i<n; i++)
fin >> a[i];
for(int i=0; i<n; i++)
r[i]=-1;
for(int i=1; i<n; i++)
{
if(a[i]>a[t[lmax]])
{
t[lmax+1]=i;
lmax++;
r[i]=t[lmax-1];
}
else if(a[i]<a[t[0]])
t[0]=i;
else if(a[i]!=a[t[lmax]])
{
int mid, st=0, dr=lmax+1;
while(st<dr)
{
mid=(st+dr)/2;
if(a[t[mid]]<a[i])
st=mid+1;
else if(a[t[mid]]>=a[i])
dr=mid;
}
t[st]=i;
r[i]=t[st-1];
}
}
fout << lmax+1 << '\n';
stack <int> s;
int ind=t[lmax];
while(r[ind]!=-1)
{
s.push(a[ind]);
ind=r[ind];
}
s.push(a[ind]);
while(!s.empty())
{
fout << s.top() << " "; s.pop();
}
return 0;
}