#include<fstream.h>

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

struct nodd{int info;
	    nodd *prec,*urm;
	   };
  nodd *prim;

void adaugf(nodd *&prim,int x)
 {nodd *nou=new nodd;
  nou->info=x;
  nou->urm=prim;
  nou->prec=0;
  prim->prec=nou;
  prim=nou;
 }

void creare(nodd *&prim)
 {int x;
  while(f>>x) adaugf(prim,x);
 }

void afis(nodd *prim)
 {nodd *p=prim;
  while(p->urm)
   {g<<p->info<<" ";
    p=p->urm;
   }
  g<<p->info<<endl;
 while(p)
  {g<<p->info<<" ";
   p=p->prec;

  }
 g<<endl;
}

void sterg(nodd *&p)
 {nodd *q,*r;
  q=p->prec;
  r=p->urm;
  q->urm=r;
  r->prec=q;
  delete p;
 }

void main()
 {creare(prim);
  afis(prim);
  nodd *p=prim->urm;
  while(p->urm)
   {nodd *q=p;
    p=p->urm;
    sterg(q);
   }
  afis(prim);

 }