#include <iostream>

using namespace std;
struct nod{int info;
nod *urm;};
nod *prim, *ultim;
void creare_adaugare(nod *&prim, nod*& ultim)
{
    nod *q=new nod;
    q->urm=NULL;
    cin>>q->info;
    if(prim==NULL)
    {
        prim=q;
        ultim=q;
    }
    else
    {
        ultim->urm=q;
        ultim=q;
    }
}
void listare()
{
    nod *c;
    c=prim;
    while(c!=0)
    {
        cout<<c->info<<" ";
        c=c->urm;
    }
    cout<<endl;
}



int main()
{
    int i,n,k=0;
    cin>>n;
    for(i=0;i<n;i++)
        creare_adaugare(prim,ultim);
        nod *c,*a;
    c=prim;

    while(c!=NULL)
        {
        if(c->info%2==1)
            {k++;
            break;}
            c=c->urm;
        }
        if(k==1)
    {a=new nod;
    a->info=4;
    a->urm=c->urm;
    c->urm=a;
    if(c==ultim)
        ultim=a;
listare();}
else cout<<"nu exista";
    return 0;
}