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#include <fstream>
#define dim 100005
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[dim], d[dim], indici[dim], p[dim], k;
void formare()
{
k=1;
d[1]=v[1];
p[1]=1;
for(int i=2; i<=n; i++)
{
if(d[k]<v[i])
d[++k]=v[i], p[i]=k;
else
{
int st=1, dr=k, poz=k+1;
while(st<=dr)
{
int m=(st+dr)/2;
if(d[m]>v[i])
poz=m, dr=m-1;
else st=m+1;
}
d[poz]=v[i];
p[i]=poz;
}
}
int j=n;
for(int i=k; i>=1; i--)
{
while(p[j]!=i)
j--;
indici[i]=j;
}
}
void afisare()
{
for(int i=1; i<=k; i++)
fout<<v[indici[i]]<<' ';
}
int main()
{
fin>>n;
for(int i=1; i<=n; i++)
fin>>v[i];
fin.close();
formare();
fout<<k<<'\n';
afisare();
fout.close();
return 0;
}