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#include <fstream>
#define FILENAME "scmax"
using namespace std;
ifstream fin(FILENAME".in");
ofstream fout(FILENAME".out");
int n,i,maxim=-1,j,ind;
int smax[100005];
int v[100005];
int deunde[100005];
int valori[100005];
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
smax[1]=1;
deunde[1]=1;
for(i=2;i<=n;i++)
{
smax[i]=1;
deunde[i]=0;
for(j=1;j<=i;j++)
{
if(v[i]>v[j])
{
if(smax[i]<smax[j]+1)
{
smax[i]=smax[j]+1;
deunde[i]=j;
}
}
}
if(smax[i]>maxim)
{
maxim=smax[i];
ind=i;
}
}
fout<<maxim << '\n';
while(ind)
{
valori[smax[ind]]=v[ind];
ind=deunde[ind];
}
for(i=1;i<=maxim;i++)
fout << valori[i] << ' ';
fout << '\n';
return 0;
}