Given a target MD5 and a wordlist on stdin, print the matching word (or 'not found').
Read input shaped like:
```
<target md5 hex>
<word 1>
<word 2>
...
```
Hash each candidate word with MD5 and compare to the target. Print the FIRST matching word; if none matches, print `not found`.
Test target = `2ab96390c7dbe3439de74d0c9b0b1767` (MD5 of "hunter2").
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