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#include<algorithm>
#include<fstream>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int v[1005],z[1005];
int f[50005], t[50005];
int n,i,j,k,ok,maxi;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
fin>>v[i];
t[i]=1;ok++;
if(v[i]>maxi)
maxi=v[i];
}
sort(v+1, v+1+n);
f[0]=1;
for(i=1;i<=n;i++)
{
if(t[v[i]]==1)
{
ok--;z[++k]=v[i];
t[v[i]]=0;
if(ok==0)
break;
}
for(j=0;j<=maxi;j++)
{
if(f[j]==1)
{
if(j+v[i]<=maxi)
{
if(f[j+v[i]]==0)
{
f[j+v[i]]=1;
if(t[j+v[i]]==1)
{
ok--;
t[j+v[i]]=0;
if(z[k]!=v[i])
z[++k]=v[i];
if(ok==0)
break;
}
}
}
else
break;
}
}
if(ok==0)
break;
}
fout<<k<<"\n";
for(i=1;i<=k;i++)
fout<<z[i]<<"\n";
fin.close();
fout.close();
return 0;
}