Basic program

[gruntfutuk]

Are you going to do this on numbers, or strings of digits?

The latter would be better.

One approach:

• create a string of even digits, evens
  
• create a string of odd digits, odds
  
• iterate through the source list of strings, for each entry:
  • build string of even digits in order found in entry i.e. digits found in evens string
    
  • build string of odd digits in order found in entry i.e. digits found in odds string
    
  • concatenate the two strings and add to list of output strings
    
• output the list of output strings