local a = io.read()
local b = io.read()

function count_chars(str)
  local tb = {}; do
    for i = 1, str:len() do
      local key = str:sub(i, i)
      if not tb[key] then
        tb[key] = 1
      else
        tb[key] = tb[key] + 1
      end
    end
  end
  return tb
end

local ans = (function ()
  for key, value in pairs(count_chars(a)) do
    if not (count_chars(b)[key] == value) then
      return false
    end
  end
  return true
end)() and (function ()
  for key, value in pairs(count_chars(b)) do
    if not (count_chars(a)[key] == value) then
      return false
    end
  end
  return true
end)() and "YES" or "NO"

print(ans)