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#include <bits/stdc++.h>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int n, v[1001];
bool rucsac[50001];
int i, j;
vector <int> ans;
int main(){
fin>>n;
for(i=1; i<=n; i++)
fin>>v[i];
for(i=1; i<=n; i++){
if(!rucsac[v[i]]){
ans.push_back(v[i]);
rucsac[v[i]]=1;
}
for(j=1; j+v[i]<=50000; j++)
if(rucsac[j])
rucsac[j+v[i]]=1;
}
fout<<ans.size()<<"\n";
for(i=0; i<ans.size(); i++)
fout<<ans[i]<<"\n";
}