class Yukicoder
  def initialize
    n = gets.to_i
    k = gets.to_i

    array = (1..n).to_a

    k.times do
      i, j = gets.split.map(&:to_i)
      array[i-1], array[j-1] = array[j-1], array[i-1]
    end

    list = gets.split.map{|i| n-i.to_i}
    array = array.map{|i| n-i}

    swap_list = []

    0.upto(n-1) do |i|
      j = array.index(list[i])

      while list[i] != array[i]
        array[j-1], array[j] = array[j], array[j-1]
        swap_list << "#{j+1} #{j}"
        j -= 1
      end
    end

    puts swap_list.size
    puts swap_list
  end
end

Yukicoder.new