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 6663
Welcome 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 contents
make slave scream contents
Meow
Executing ./260346028 count 392
Expected three got Good job!
TUCTF{Isn't_1t_FuN_T0_L3ARn_A_N3W_L4NGUAG3!}
```