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#include <fstream>
#define N 100002
using namespace std;
int lg[N],sol[N],nr,v[N];
int dinamica(int x)
{
if(nr==0 || v[sol[nr]]<x)
{
++nr;
return nr;
}
else
{
int st=1,dr=nr,mij;
int poz=0;///NU UITA de initializarea asta!!!!
while(st<=dr)
{
mij=(st+dr)/2;
if(v[sol[mij]]<x)
poz=mij,st=mij+1;
else
dr=mij-1;
}
return poz+1;
}
}
int main()
{
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,x,poz,ma=0,st;
f>>n;
for(int i=1;i<=n;++i)
{
f>>x,v[i]=x;
poz=dinamica(x);
sol[poz]=i;
lg[i]=lg[sol[poz-1]]+1;
if(lg[i]>ma)
ma=lg[i];
}
g<<ma<<"\n";
for(int k=1;k<=ma;++k)
{
st=2000000002;
for(int i=1;i<=n;++i)
if(lg[i]==k && st>v[i])
st=v[i];
g<<st<<' ';
}
f.close();
g.close();
return 0;
}