A format for expressing an ordered list of integers is to use a comma separated list of either

 individual integers
 Or a range of integers denoted by the starting integer separated from the end integer in the range by a dash, '-'. (The range includes all integers in the interval including both endpoints)
 The range syntax is to be used only for, and for every range that expands to more than two values.
Example

The list of integers:

 -6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20
Is accurately expressed by the range expression:

 -6,-3-1,3-5,7-11,14,15,17-20
(And vice-versa).

Task

 Create a function that takes a list of integers in increasing order and returns a correctly formatted string in the range format. 
 Use the function to compute and print the range formatted version of the following ordered list of integers. (The correct answer is: 0-2,4,6-8,11,12,14-25,27-33,35-39).


    0,  1,  2,  4,  6,  7,  8, 11, 12, 14,
   15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
   25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
   37, 38, 39

 Show the output of your program.


Related task

   Range expansion


Function Range_Extraction(list)
	num = Split(list,",")
	For i = 0 To UBound(num)
		startnum = CInt(num(i))
		sum = startnum
		Do While i <= UBound(num)
			If sum = CInt(num(i)) Then
				If i = UBound(num) Then
					If startnum <> CInt(num(i)) Then
						If startnum + 1 = CInt(num(i)) Then
							Range_Extraction = Range_Extraction & startnum & "," & num(i) & ","
						Else
							Range_Extraction = Range_Extraction & startnum & "-" & num(i) & ","
						End If
					Else
						Range_Extraction = Range_Extraction & startnum & ","
					End If
                                        Exit Do
				Else
					i = i + 1
					sum = sum + 1
				End If
			Else
				If startnum = CInt(num(i-1)) Then
					Range_Extraction = Range_Extraction & startnum & ","
				Else
					If startnum + 1 = CInt(num(i-1)) Then
						Range_Extraction = Range_Extraction & startnum & "," & num(i-1) & ","
					Else
						Range_Extraction = Range_Extraction & startnum & "-" & num(i-1) & ","
					End If
				End If
				i = i - 1
				Exit Do
			End If
		Loop
	Next
	Range_Extraction = Left(Range_Extraction,Len(Range_Extraction)-1)
End Function
 
WScript.StdOut.Write Range_Extraction("0,1,2,4,6,7,8,11,12,14,15,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,32,33,35,36,37,38,39")