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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("economie.in");
ofstream fout ("economie.out");
int v[1005],dp[50005],i,j,n,sol[1005],nr=0;
long long s=0;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
sort(v+1,v+n+1);
for(i=1;i<=n;i++)
if(dp[v[i]]==0)
{
sol[++nr]=v[i];
dp[v[i]]=1;
for(j=0;j<=50005-v[i];j++)
if(dp[j]==1)
dp[j+v[i]]=1;
}
fout<<nr<<'\n';
for(i=1;i<=nr;i++)
fout<<sol[i]<<'\n';
return 0;
}