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#include <bits/stdc++.h>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int a[1001],sol[1001];
bitset<50001>es;
int n,i,mx,fi,j;
int main()
{
fin>>n;
for(i=1;i<=n;i++)fin>>a[i],mx=max(mx,a[i]);
sort(a+1,a+n+1);
es[0]=1;
fi=0;
for(i=1;i<=n;i++)
{
if(!es[a[i]])
sol[++fi]=a[i];
for(j=0;j+a[i]<=mx;j++)
if(es[j])
es[j+a[i]]=1;
}
fout<<fi<<"\n";
for(i=1;i<=fi;i++)fout<<sol[i]<<"\n";
return 0;
}