n = io.read("*n", "*l")
as = io.read()
bs = io.read()
a = {}
b = {}
for w in as:gmatch("%w+") do
  if not a[w] then a[w] = 1 else a[w] = a[w] + 1 end
end
for w in bs:gmatch("%w+") do
  if not b[w] then b[w] = 1 else b[w] = b[w] + 1 end
end
for k, v in pairs(a) do
  if not b[k] or b[k] < v then
    print(k)
  end
end