From syslog.log, write each unique IP that appears on a 'Failed password' line into /tmp/bad_ips.txt.
Find every line in `/var/log/syslog.log` containing `Failed password`, extract the IP at the end of the line (it's whitespace-field 13 with awk), and write the unique sorted list to `/tmp/bad_ips.txt`.
Expected:
```
10.0.0.7
```
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