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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
const int dim1=1005,dim2=5e4+5;
int a[dim1],n,len,sol[dim1];
bool viz[dim2];
int main(){
ifstream f("economie.in");
ofstream g("economie.out");
f>>n;
for(int i=1;i<=n;i++){
f>>a[i];
}
sort(a+1,a+n+1);
viz[0]=1;
for(int i=1;i<=n;i++){
if(!viz[a[i]]){
viz[a[i]]=1;
sol[++len]=a[i];
for(int j=a[i];j<dim2;j++){
if(viz[j-a[i]]){
viz[j]=1;
}
}
}
}
g<<len<<'\n';
for(int i=1;i<=len;i++){
g<<sol[i]<<' ';
}
return 0;
}