Modify python script to use stdout text as next stdin prompt in a loop - $100 max

Using ubuntu 18.04 and experimenting with python3 text generating repos as per this simple example: python3 [login to view URL] < [login to view URL] >> [login to view URL] '[login to view URL]' is a text file with one sentence per line. If '[login to view URL]' is 100 seed lines then 100 sequences will be written and appended to '[login to view URL]' based on the parameters used. This works without errors. Instead of using '[login to view URL]' as input I would like to create a input-output loop that accomplishes the following: 1. Each generated output sequence from '[login to view URL]' is used as the next seed input for the same script. For example. If '[login to view URL]' outputs 'The boy ran up the hill' that becomes the next input string for the python script. 2. Result from #1 above produces the next output sequence and is written to '[login to view URL]' This file contains both the generated sequences and generated seed lines. 3. Process repeats until the loop is terminated. This could be at count 100 or any value. 4. This would require only a single initial input seed line. All other seed input lines that follow are the generated output sequences from the '[login to view URL]' script. I have tried to pipe the output as input but this only works if there are two different python scripts used. Perhaps there is a simple combination of pipe, subprocess, tee or something else that will work. Budget is $100 max for a working code snippet that can be added to '[login to view URL]'