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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int v[1002],n,i,j,sol[1002],k;
bool s[1000*50000+2];
int main(){
fin>>n;
for(i=1;i<=n;i++){
fin>>v[i];
}
sort(v+1,v+n+1);
s[0]=1;
for(i=1;i<=n;i++)
if(!s[v[i]]){
sol[++k]=i;
for(j=0;j<=v[n] && j+v[i]<=v[n];j++)
if(s[j]==1)
s[j+v[i]]=1;
}
fout<<k<<'\n';
for(i=1;i<=k;i++)
fout<<v[sol[i]]<<'\n';
fin.close();fout.close();
return 0;
}