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#include <bits/stdc++.h>
#define Nmax 100001
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[Nmax],Q[Nmax],P[Nmax],sol[Nmax];
int cauta(int val)
{
int step,best;
for(step=1; step<=Q[0];step<<=1);
for(best=0;step;step>>=1)
{
if(best+step<=Q[0] && Q[best+step]<val) best+=step;
}
return best+1;
}
int main()
{
int n,i,poz;
fin>>n;
for(i=1;i<=n;i++) fin>>v[i];
for(i=1;i<=n;i++)
{
poz=cauta(v[i]);
if(poz==Q[0]+1)
{
Q[0]++;
Q[Q[0]]=v[i];
P[i]=Q[0];
}
else
{
Q[poz]=v[i];
P[i]=poz;
}
}
fout<<Q[0]<<"\n";
poz=n;
for(i=Q[0];i>=1;i--)
{
while(P[poz]!=i) poz--;
sol[i]=v[poz];
}
for(i=1;i<=Q[0];i++) fout<<sol[i]<<" ";
}