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#include<fstream>
#include<map>
#include<algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int n,m,i,j,k,a[1005],b[1005];
map<int,bool>viz;
int main()
{
f>>n;
for(i=1;i<=n;i++) f>>a[i];
sort(a+1,a+n+1);
if(a[1]==1) {g<<1<<"\n"<<1; return 0;}
else
{
for(int i=1;i<=n;i++)
{
if(!viz[a[i]])
{viz[a[i]]=1;
for(int j=1;j<=50000-a[i];j++)
if(viz[j])
viz[j+a[i]]=1;
b[++k]=a[i];}
}
}
g<<k<<"\n";
for(i=1;i<=k;i++) g<<b[i];
return 0;
}