C++

Read a 4 character number.

Output the result in the following format, input = 9873 as an odd output number with

3 333 7 7777777

8 88888888

9 999999999

If even and one of the numbers is not a digit, then put a NAN mark input = 98a4 having the following format.

4 ****

a NAN

8 ********

9 *********