I have two columns, column A and column B. All column B values are contained in column A, but not all column A values exist in column B. I want to list the differences in say, column C. Also the values may be repeating.

Lets say my column A values are: A, A, A, B, B, B, C, C, D, D, D, E

column B values are: A, B, D

column C values would then be: C, E

How do I create a macro or formula to produce column C?