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#include <bits/stdc++.h>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int n,v[1005],dp[50005];
int ver[50005];
int main()
{
fin>>n;
int aux=n,sol=1;
for(int i=1;i<=n;i++){
fin>>v[i];
ver[v[i]]=1;
}
sort(v+1,v+n+1);
for(int i=1;i<=n;i++){
if(ver[v[i]]){
dp[v[i]]=1;
ver[v[i]]=0;
aux--;
}
for(int j=1;j<=v[n];j++)
{
if(ver[j+v[i]])
{
ver[j+v[i]]=0;
aux--;
}
dp[j+v[i]]=1;
}
if(aux==0)
{
sol=i;
break;
}
}
fout<<sol<<"\n";
for(int i=1;i<=sol;i++)
fout<<v[i]<<"\n";
return 0;
}