--- Revision None
+++ Revision 323136613639
@@ -0,0 +1,78 @@
+Option Explicit
+
+Class cls_List
+	Public Head
+	Public Tail
+End Class
+
+Function fun_cons(head, tail)
+	Dim list
+	Set list = New cls_List
+	list.Head = head
+	Set list.Tail = tail
+	Set fun_cons = list
+End Function
+
+Function fun_rev(list, rev)
+	If list Is Nothing Then
+		Set fun_rev = rev
+	Else
+		Set fun_rev = fun_rev(list.Tail, fun_cons(list.Head, rev))
+	End If
+End Function
+
+Function fun_join(list, sep)
+	If list Is Nothing Then
+		fun_join = ""
+	Else
+		If list.Tail Is Nothing Then
+			fun_join = list.Head
+		Else
+			fun_join = list.Head & sep & fun_join(list.Tail, sep)
+		End If
+	End If
+End Function
+
+Function fun_div(s, n)
+	If Len(s) = "" Then
+		Set fun_div = Nothing
+	Else
+		Dim list
+		Set list = Nothing
+
+		Dim i
+		
+		For i = 1 + n To Len(s) Step n
+			Set list = fun_cons(Mid(s, i - n, n), list)
+		Next
+		
+		Set list = fun_cons(Mid(s, i - n, Len(s) - (i - n) + 1), list)
+		
+		Set fun_div = fun_rev(list, Nothing)
+	End If
+End Function
+
+Function fun_format(num, n, sep)
+	Dim r
+	r = StrReverse(num)
+	Set r = fun_div(r, n)
+	r = fun_join(r, sep)
+	r = StrReverse(r)
+	fun_format = r
+End Function
+
+Sub fun_main()
+	Call WScript.Echo(fun_format("", 3, ","))
+	Call WScript.Echo(fun_format("0", 3, ","))
+	Call WScript.Echo(fun_format("90", 3, ","))
+	Call WScript.Echo(fun_format("890", 3, ","))
+	Call WScript.Echo(fun_format("7890", 3, ","))
+	Call WScript.Echo(fun_format("67890", 3, ","))
+	Call WScript.Echo(fun_format("567890", 3, ","))
+	Call WScript.Echo(fun_format("4567890", 3, ","))
+	Call WScript.Echo(fun_format("34567890", 3, ","))
+	Call WScript.Echo(fun_format("234567890", 3, ","))
+	Call WScript.Echo(fun_format("1234567890", 3, ","))
+End Sub
+
+fun_main