#include <iostream>
#include <algorithm>
#include <fstream>
#include <cmath>
using namespace std;

ifstream f("economie.in");
ofstream g("economie.out");

int n,v[1005],dr[1005],nr=0,tr=0;
bool ghiozdan[50005];

int main()
{
f>>n;
for(int i=1;i<=n;i++)
  f>>v[i];
sort(v+1,v+n+1);
bool OK=0;
while(OK==0)
 {
  OK=1; tr++;
  if(ghiozdan[v[tr]]==0)
   {
    nr++;
    dr[nr]=v[tr];
    ghiozdan[v[tr]]=1;
    for(int i=1;i<=50000;i++)
     if(i-dr[nr]>0)
    ghiozdan[i]=ghiozdan[i-dr[nr]];
    OK=0;
   }
  else OK=0;
  if(tr==n) OK=1;
 }
g<<nr;
for(int i=1;i<=nr;i++)
 g<<endl<<dr[i];
}