> For the complete documentation index, see [llms.txt](https://ctf.zeyu2001.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ctf.zeyu2001.com/2021/umdctf-2021/l33t-m4th.md).

# L33t M4th

Math problems... but in words instead of numbers... and with l33t sp34k...

I used the `word2number` library to convert the words to numbers, a dictionary to map the l33t speak, and a bunch of if-else statements for the operators. Then, the result is calculated using `eval()`.

```python
from pwn import *
from word2number import w2n

conn = remote('chals3.umdctf.io', 6003)

mapping = {
    '1': 'i',
    '3': 'e',
    '0': 'o',
    '7': 't',
    '5': 's',
    '4': 'a',
    '$': 's',
}

conn.recv()
conn.send('\n')

done = False
received = ""

while not done:

    data = conn.recvuntil('What is RESULT').decode()

    # print(data)
    variables = []
    for line in data.split('\n')[1:-2]:
        line = line.split('=')[1][1:]
        line = ''.join([mapping[char] if char in mapping else char for char in line])

        words = line.split()
        # print(words)

        to_eval = ''

        number = ''
        for word in words:
            # print(number)
            if word == 'hundreed':
                word = 'hundred'

            if word == 'fourty':
                word = 'forty'

            if word == 'or':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '|'
                number = ''

            elif word == 'and':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '&'
                number = ''

            elif word == 'times':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '*'
                number = ''

            elif word == 'divided':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '//'
                number = ''

            elif word == 'Pius' or word == 'plus':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '+'
                number = ''

            elif word == 'MiNus' or word == 'minus':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '-'
                number = ''

            elif word == 'mod':
                to_eval += str(w2n.word_to_num(number))
                to_eval += '%'
                number = ''

            else:
                number += word + ' '

        to_eval += str(w2n.word_to_num(number))

        # print(to_eval)
        variables.append(eval(to_eval))

    # print(variables)

    result_line = data.split('\n')[-2]
    line = result_line.split('=')[1][1:]
    line = ''.join([mapping[char] if char in mapping else char for char in line])
    words = line.split()
    # print(words)

    curr_var = 0
    to_eval = ''
    for word in words:
        if 'var' in word:
            to_eval += str(variables[curr_var])
            curr_var += 1

        else:
            if word == 'or':
                to_eval += '|'

            elif word == 'and':
                to_eval += '&'

            elif word == 'times':
                to_eval += '*'

            elif word == 'divided':
                to_eval += '//'

            elif word == 'Pius' or word == 'plus':
                to_eval += '+'

            elif word == 'MiNus' or word == 'minus':
                to_eval += '-'

            elif word == 'mod':
                to_eval += '%'

    # print(to_eval)
    result = eval(to_eval)
    # print(result)

    conn.send(str(result))
    received = conn.recvuntil('more equations to go!\n').decode()
    print(received)

    if '0 more equations' in received:
        done = True
        print(conn.recv())

conn.close()
```

![](/files/-MYcEUfBLcr6wLOPa5WB)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ctf.zeyu2001.com/2021/umdctf-2021/l33t-m4th.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.