Write two shell scripts:

1. First script:
   1. Create directory
   2. In directory create 50 files with different names using for cycle. File name format: abX.txt, where X is a number from 40 to 90.
   3. In environment variable store file names that contain even numbers only.
   4. Run a second script
2. Second script:
   1. Display the contents of the directory
   2. Only delete files, which names are stored in the environment variable
   3. Display the contents of the directory