diff --git a/lib/day5/day5.ex b/lib/day5/day5.ex
index 4433f57..375d969 100644
--- a/lib/day5/day5.ex
+++ b/lib/day5/day5.ex
@@ -63,7 +63,7 @@ defmodule Day5 do
     ])
   end
 
-  def run_cli(memory) do
+  def run_cli(memory, opts \\ []) do
     parent = self()
 
     proc =
@@ -71,23 +71,33 @@ defmodule Day5 do
         run(memory, parent)
       end)
 
-    Process.monitor(proc)
-    handle_cli_messages(proc)
+    handle_cli_messages(proc, opts)
   end
 
-  def handle_cli_messages(proc) do
+  def handle_cli_messages(proc, opts) do
     receive do
-      {:DOWN, _, _, _, _} ->
-        IO.puts("Exited")
+      {:halt, _, memory} ->
+        if Keyword.get(opts, :memory, false) do
+          memory
+        else
+          :ok
+        end
+
+      {:ok, _, memory} ->
+        if Keyword.get(opts, :memory, false) do
+          memory
+        else
+          :ok
+        end
 
       {:in, _} ->
         res = IO.gets("intcode> ") |> String.trim() |> String.to_integer()
         send(proc, {:in, res})
-        handle_cli_messages(proc)
+        handle_cli_messages(proc, opts)
 
       {:out, _, out} ->
         IO.puts("Output: #{out}")
-        handle_cli_messages(proc)
+        handle_cli_messages(proc, opts)
     end
   end
 
diff --git a/lib/intcode/assembler.ex b/lib/intcode/assembler.ex
index 0e3915c..4acbf32 100644
--- a/lib/intcode/assembler.ex
+++ b/lib/intcode/assembler.ex
@@ -18,20 +18,15 @@ defmodule Assembler do
     |> ignore(ascii_char([?:]))
     |> ignore(repeat(ascii_char([?\s])))
 
-  data_label =
-    label
-    |> choice([
-      integer(min: 1),
-      ignore(ascii_char([?-]))
-      |> integer(min: 1)
-      |> tag(:neg)
-    ])
-    |> tag(:data_label)
-
   param =
     optional(ignore(ascii_string([?\s], min: 1)))
     |> ascii_string([{:not, ?,}], min: 1)
 
+  data_label =
+    label
+    |> concat(param)
+    |> tag(:data_label)
+
   instruction =
     ignore(ascii_string([?\s, ?\t], min: 0))
     |> ascii_string([?a..?z], min: 1)
@@ -63,7 +58,13 @@ defmodule Assembler do
     |> Enum.with_index()
     |> Enum.map(fn
       {{:expr, expr}, index} ->
-        expr_tokens = if is_binary(expr), do: ExpressionEvaluator.parse(expr), else: expr
+        expr_tokens =
+          if is_binary(expr) do
+            {:ok, tokens, _, _, _, _} = ExpressionEvaluator.parse(expr)
+            tokens
+          else
+            expr
+          end
 
         ExpressionEvaluator.do_eval(expr_tokens, fn
           "_self" -> index
@@ -134,11 +135,7 @@ defmodule Assembler do
   end
 
   def assemble_line([data_label: [name, value]], {memory, labels}) do
-    value =
-      case value do
-        {:neg, [val]} -> -val
-        val when is_integer(val) -> val
-      end
+    value = {:expr, value}
 
     {
       [value | memory],
@@ -197,6 +194,15 @@ defmodule Assembler do
     [99 | memory]
   end
 
+  def assemble_insn(["data" | data], memory) do
+    data =
+      data
+      |> Enum.map(&String.to_integer/1)
+      |> Enum.reverse()
+
+    data ++ memory
+  end
+
   # macros
   assemble_macro ["mov", src, dest],
                  """