N = gets.to_i
customers = 20.times.map{[]}

$<.map{|s|
  # p customers
  sa = s.split
  case sa.shift
  when ?0
    n, m, *a = sa
    customers[n.to_i-1] = a
  when ?1
    neta = sa.shift
    p (customers.index{|wish_list|
      idx = wish_list.index(neta)
      idx && wish_list.delete_at(idx)
    } || -2) + 1
  else
    n = sa.shift.to_i
    customers[n - 1] = Array.new
  end
}