microsoft excel - How to split numbers into columns with negative and positive values, without empty cells?

Given positive and negative values in column A of an Excel sheet, I want column B to list the positive values from column A, and column C to show the negative values, in the order in which they appear in column A.

However, I don't want any empty cells in columns B and C.

So, I do NOT want:

   A     B     C
----------------
 All   >=0    <0
 100   100
-300        -300
-800        -800
 900   900
 700   700
-200        -200
 900   900

But instead, I want:

   A     B     C
----------------
 All   >=0    <0
 100   100  -300
-300   900  -800
-800   700  -200
 900   900
 700
-200
 900