uses crt;
type PSTRC=^Strc;
     Strc=record
     inf:integer;
     ptr:Pstrc;
end;
var S1,s2:PSTRC;
    i,k,g,p:integer;
    err:boolean;
    a:array [1..20] of integer;
Procedure Dop(var S:Pstrc;dat:integer);
var nov:Pstrc;
begin
New(nov);
nov^.inf:=dat;
nov^.Ptr:=s;
S:=nov;
end;
Function Ud(var S:Pstrc; var err:boolean):integer;
var old:Pstrc;
begin
 if s<>Nil then
  begin
   old:=S;
   S:=S^.ptr;
   Ud:=old^.inf;
   dispose(old);
   err:=false
  end
 else
  begin
   Ud:=0;
   err:=true
  end
end;
Function Cht(s:PSTRC; var err:boolean):integer;
begin
if s<>Nil then
 begin
  write('inf=',s^.inf:3);
  err:=false;
  Cht:=s^.inf;
 end
else begin
      writeln('stack pust');
      err:=True;
      cht:=0;
     end;
end;
BEGIN
 clrscr;
 i:=1;
 k:=1;
 while k<>0 do
  begin
   readln(k);
   Dop(s1,k);
  end;
 while s1<>Nil do
  begin
   a[i]:=Ud(s1,err);
   inc(i);
  end;
 for k:=i downto 1 do
  dop(s2,a[k]);
 for k:=1 to i do
  writeln(ud(s2,err));
readln;
END.