The service running on poetry.tuctf.com:6663 was expecting fetLang code and "Meow" at the end to execute it.
By downloading fetLang https://github.com/Property404/fetlang and studing it, we were able to write the code to read the file flag.txt
```$ nc poetry.tuctf.com 6663Welcome to the Poem Prose Parsing Tool(I have a fetish for assertiveness)(I have a fetish for obedience)
(file handling)make filename moan "flag.txt"have filename demand obedience of contentsmake slave scream contentsMeowExecuting ./260346028 count 392Expected three got Good job!TUCTF{Isn't_1t_FuN_T0_L3ARn_A_N3W_L4NGUAG3!}```