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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
vector<int> a, best, poz;
int n, x, maxim, sol=0, p;
int main()
{
ifstream fin("scmx.in");
fin>>n;
while(fin>>x)
a.push_back(x);
fin.close();
best=vector<int>(n, -1);
poz=vector<int>(n,-1);
best[n-1]=1;
poz[n-1]=-1;
maxim=1, p=n;
for(int i=n-2; i>=0; i--)
{
best[i]=1; poz[i]=-1;
for(int j=i; j<n;j++)
if(a[i]<a[j] && best[i]<best[j]+1)
{
best[i]=best[j]+1; poz[i]=j;
if(best[i]>maxim) maxim=best[i], p=i;
}
}
ofstream fout("scmx.out");
fout<<maxim<<"\n";
int i=p;
while(i!=-1)
fout<<a[i]<<" ", i=poz[i];
fout.close();
return 0;
}