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#include<fstream>
#include<algorithm>
using namespace std;
ifstream in("economie.in");
ofstream out("economie.out");
int n,x,l, a[1009],sol[1009];
bool v[50009];
int main()
{
in>>n;
for(int i=1;i<=n;i++)
in>>a[i];
sort(a+1,a+n+1);
v[0]=1;
for(int i=1;i<=n;i++)
{
if(!v[a[i]])
{
sol[++l]=a[i];
v[a[i]]=1;
for(int k=0;k<=50000-a[i];k++)
if(v[k]) v[k+a[i]]=1;
}
}
out<<l<<'\n';
for(int i=1;i<=l;i++)
out<<sol[i]<<'\n';
out.close();
return 0;
}