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#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;
int v[10001],n,i,sm;
int compare(const void *a,const void *b)
{
return *(int*)a - *(int*)b;
}
int cmmdc(int p)
{
int a=sm,b,j;
for(j=p+1;j<n;j++)
{
b=v[j];
while(a!=b)
{
if(a>b) a=a-b;
else b=b-a;
}
a=v[j];
}
return b;
}
int main()
{
ifstream f("economie.in");
ofstream g("economie.out");
f>>n;
for(i=0;i<n;i++)
f>>v[i];
qsort(v,n,sizeof(int),compare);
for(i=0;i<n;i++)
{
sm+=v[i];
if(sm==cmmdc(i))
{
g<<i+1<<"\n";
for(int j=0;j<=i;j++)
g<<v[j]<<"\n";
return 0;
}
}
g<<0;
}