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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i,poz,st,dr,v[100005],mij,x[100005],l[100005],sol[100005],m,lg,ult;
int main()
{
fin>>n;
int k=0;
for(i=1;i<=n;i++)
{
fin>>v[i];
}
for(i=1;i<=n;i++)
{
st=1;
dr=k;
poz=k+1;
while(st<=dr)
{
mij=(st+dr)/2;
if(v[i]>x[mij])
{
st=mij+1;
}
else
{
poz=mij;
dr=mij-1;
}
}
x[poz]=v[i];
l[i]=poz;
if(poz==k+1)
k++;
}
fout<<k<<'\n';
lg=k;
ult=2000000000;
i=n;
m=0;
while(lg>0)
{
if(l[i]==lg&&v[i]<ult)
{
sol[++m]=v[i];
lg--;
ult=v[i];
}
i--;
}
for(i=m;i>=1;i--)
fout<<sol[i]<<" ";
return 0;
}