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#include <bits/stdc++.h>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int n,m,sol[100001],v[100001],d[100001];
int main(){
fin>>n;
for(int i=1;i<=n;i++)fin>>v[i];
sort(v+1,v+n+1);
for(int i=1;i<=n;i++){
if(d[v[i]]==0){
sol[++m]=v[i];
d[v[i]]=1;
}
for(int j=1;j<=50000-v[i];j++){
if(d[j]){
d[j+v[i]]=1;
}
}
}
fout<<m<<'\n';
for(int i=1;i<=m;i++)fout<<sol[i]<<' ';
}