local n, k = io.read("*n", "*n")
local t = {}
for i = 1, n do t[i] = i end
for i = 1, k do
  local a, b = io.read("*n", "*n")
  t[a], t[b] = t[b], t[a]
end
local goal = {}
for i = 1, n do goal[i] = 0 end
for i = 1, n do
  local a = io.read("*n")
  goal[a] = i
end
local strlist = {}
for i_g = 1, n - 1 do
  for i_c = i_g, n do
    if t[i_c] == goal[i_g] then
      for i = i_c, i_g + 1, -1 do
        table.insert(strlist, (i - 1 .. " " .. i))
        t[i], t[i - 1] = t[i - 1], t[i]
      end
    end
  end
end
local len = #strlist
print(len)
for i = 1, len do print(strlist[i]) end