type
  ttype=^ntype;
  ntype=record
    f,t,v:longint;
    next:ttype;
  end;
var
  a,la,lb,p,q:ttype;
  i,j,k,x,y,z,n,r:longint;
begin
  read(n);
  la:=nil;
  lb:=nil;
  for i:=1 to n do begin
    new(p);read(x,y,z);
    if x>y then begin r:=x;x:=y;y:=r;end;
    p^.f:=x;p^.t:=y;p^.v:=z;p^.next:=nil;
    if la=nil then la:=p else begin
      q:=la;
      if q^.f>p^.f then begin
        p^.next:=q;
        la:=p;
      end else begin
        while q^.next<>nil do begin
          if q^.next^.f>p^.f then break;
          q:=q^.next;
        end;
        p^.next:=q^.next;
        q^.next:=p;
      end;
    end;
  end;
  readln;
  read(n);
  for i:=1 to n do begin
    new(p);read(x,y,z);
    if x>y then begin r:=x;x:=y;y:=r;end;
    p^.f:=x;p^.t:=y;p^.v:=z;p^.next:=nil;
    if lb=nil then lb:=p else begin
      q:=lb;
      if q^.f>p^.f then begin
        p^.next:=q;
        lb:=p;
      end else begin
        while q^.next<>nil do begin
          if q^.next^.f>p^.f then break;
          q:=q^.next;
        end;
        p^.next:=q^.next;
        q^.next:=p;
      end;
    end;
  end;
  a:=la;
  while (lb<>nil)and(a<>nil) do begin
    while (lb<>nil)and(lb^.t<a^.f) do lb:=lb^.next;
    if lb=nil then break;
    while (a<>nil)and(a^.t<lb^.f) do a:=a^.next;
    if a=nil then break;
    if lb^.f<=a^.f then begin
      if lb^.t>=a^.t then begin
        a^.t:=a^.f;
        a:=a^.next;
      end else begin
        a^.f:=lb^.t;
        lb:=lb^.next;
      end;
    end else begin
      if lb^.t>=a^.t then begin
        a^.t:=lb^.f;
        lb:=lb^.next;
      end else begin
        new(q);
        q^.f:=lb^.t;
        q^.t:=a^.t;
        q^.v:=a^.v;
        a^.t:=lb^.f;
        q^.next:=a^.next;
        a^.next:=q;
        lb:=lb^.next;
      end;
    end;
  end;
  a:=la;
  i:=0;
  while a<>nil do begin
    if a^.t>a^.f then inc(i);
    a:=a^.next;
  end;
  write(i,' ');
  while la<>nil do begin
    if la^.t>la^.f then write(la^.f,' ',la^.t,' ',la^.v,' ');
    la:=la^.next;
  end;
  writeln;
end.