var
  flag:boolean;
  total,n,i,j,l,k:integer;
  b:array [1..10000] of boolean;
  data,a:array [1..10000] of integer;

begin
  read(n);
  k:=0;
  fillchar(data,sizeof(data),0);
  fillchar(b,sizeof(b),true);
  for i:=1 to n do
    begin
      read(l);
      total:=0;
      for j:=1 to l do
        begin
          read(a[j]);
          if b[a[j]] then inc(total);
        end;
      if total>1 then
        begin
          b[i]:=false;
          inc(k);
          data[k]:=i;
        end;
    end;
  if k<=n-k then
    begin
      writeln(k);
      for i:=1 to k do
        write(data[i],' ');
    end
    else
      begin
        writeln(n-k);
        for i:=1 to n do
          begin
            flag:=true;
            for j:=1 to k do
              if i=data[j] then flag:=false;
            if flag then write(i,' ');
          end;
      end;
  writeln;
end.