program resume;
var
  i,j,n,a,b,m,p,temp:integer;
  tab,t2:array[1..50,1..50]of integer;
  point,p2:array[1..50]of integer;
begin
  fillchar(tab,sizeof(tab),0);
  fillchar(point,sizeof(point),0);
  fillchar(p2,sizeof(p2),0);
  fillchar(t2,sizeof(t2),0);
  assign(input,'resume.in');
  assign(output,'resume.out');
  reset(input);
  rewrite(output);
  readln(m);
  while not(eof) do
  begin
    readln(a,b);
    tab[a,b]:=1;
    tab[b,a]:=1;
    point[a]:=point[a]+1;
    point[b]:=point[b]+1;
  end;
  for i:=1 to m do
  begin
    if (point[i]=2)and(p2[i]<2) then begin
      while p2[i]<2 do
      begin
        for j:=1 to m do
          if tab[i,j]=1 then begin
            p2[i]:=p2[i]+1;
            p2[j]:=p2[j]+1;
            tab[i,j]:=0;
            tab[j,i]:=0;
            t2[i,j]:=1;
            t2[j,i]:=1;
          end;
      end;
    end;
  end;
  while true do
  begin
    p:=0;
    for i:=1 to m do
      if p2[i]<2 then begin
        for j:=1 to m do
          if (i<>j)and(p2[j]<2)and(tab[i,j]=1) then begin
            p2[i]:=p2[i]+1;
            p2[j]:=p2[j]+1;
            t2[i,j]:=1;
            t2[j,i]:=1;
            p:=1;
          end;
      end;
    if p=0 then break;
  end;
  write(1,' ');
  fillchar(p2,sizeof(p2),0);
  p2[1]:=1;
  temp:=32767;
  for i:=2 to m do
    if t2[1,i]=1 then begin
      if i<temp then temp:=i;
    end;
  write(temp,' ');
  p2[temp]:=1;
  for i:=1 to m-2 do
  begin
    for j:=1 to m do
    begin
      if (t2[temp,j]=1)and(p2[j]=0) then begin
        write(j,' ');
        temp:=j;
        p2[j]:=1;
      end;
    end;
  end;
  close(input);
  close(output);
end.