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#include<fstream>
#include<algorithm>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int v[1001],sol[1001];
bool fr[50001];
int main()
{
int n,rez=0,poz=0;
fin>>n;
for(int i=0;i<n;i++)
{
fin>>v[i];
}
sort(v,v+n);
int valmax=v[n-1];
fr[0]=1;
for(int i=0;i<n;i++)
{
if(fr[v[i]]==0)
{
rez++;
sol[rez]=v[i];
fr[v[i]]=1;
for(int j=0;j+v[i]<=valmax;j++)
{
if(fr[j]==1)
fr[j+v[i]]=1;
}
}
}
fout<<rez<<"\n";
for(int i=1;i<=rez;i++)
fout<<sol[i]<<" ";
}