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#include <fstream>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
const int Nmax=100001;
int v[Nmax],ant[Nmax],ps,n,a,lmax,l[Nmax];
void solutie(int ps)
{ if(ps>0)
{
solutie(ant[ps]);
out<<v[ps]<<" ";
}
}
int main()
{ int i,j;
in>>n;
for(i=1;i<=n;i++)
in>>v[i];
for(i=1;i<=n;i++)
{ lmax=0;
a=-1;
for(j=1;j<i;j++)
{ if(v[j]<v[i])if(l[j]>lmax)
{ lmax=l[j];
a=j;
}
}
ant[i]=a;
l[i]=lmax+1;
}
lmax=0;
for(i=1;i<=n;i++)
{
if(l[i]>lmax)
{ lmax=l[i];
a=i;
}
}
out<<lmax<<endl;
solutie(a);
return 0;
}