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#include <iostream>
#include <stack>
#include <fstream>
using namespace std;
ifstream in("scmax,in");
ofstream out("scmax.out");
const int MAX=1e6+1;
int v[MAX],n,lg[MAX],lgmax,prev[MAX];
int main()
{
in>>n;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<=n;i++)
{
int st=1,dr=lgmax;
while(st<=dr)
{
int mij=(st+dr)/2;
if(v[lg[mij]]<v[i])
st=mij+1;
else dr=mij-1;
}
if(st>lgmax)
lgmax=st;
lg[st]=i;
prev[i]=lg[dr];
}
stack <int> s;
int poz=lg[lgmax];
while(poz!=0)
{
s.push(v[poz]);
poz=prev[poz];
}
out<<lgmax<<'\n';
while(!s.empty())
{
out<<s.top()<<' ';
s.pop();
}
return 0;
}