I heard you have some "delusions of grandeeur" about your typing speed. How fast can you go at shell2017.picoctf.com:51091?
Use the nc command to connect!
I hear python is a good means (among many) to generate the needed input.
It might help to have multiple windows open
This one was as simple as making a python script, changing a couple variables, running it, copy, paste and succeed. The script was just a for loop that looped the number of letters they needed, followed by the number they wanted. I copied that and pasted it in the terminal with time to spare. It was easy.