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#include<fstream>
#include<algorithm>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int Poz[50003],V[1003],N,Sol[1003],Nr;
int main()
{
fin>>N;
for(int i=1;i<=N;i++)
fin>>V[i];
sort(V+1,V+1+N);
Poz[0]=1;
for(int i=1;i<=N;i++)
{
if(Poz[V[i]]==0)
{
for(int j=0;j<=V[N];j++)
if(j+V[i]>V[N])
break;
else
if(Poz[j]==1)
Poz[j+V[i]]=1;
Nr++;
Sol[Nr]=V[i];
}
}
fout<<Nr<<'\n';
for(int i=1;i<=Nr;i++)
fout<<Sol[i]<<'\n';
}