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Review the challenge brief, files, and requirements.
Parse the DNS records to extract all subdomains for target.com.
target.com. A 192.168.1.1
www.target.com. A 192.168.1.2
mail.target.com. A 192.168.1.3
dev.target.com. A 192.168.1.4
api.target.com. A 192.168.1.5
secret.target.com. A 192.168.1.6
Return sorted list of subdomains (not including root domain).
Output: Print the sorted Python list of subdomain names (e.g., ['api', 'dev', 'mail']).
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