Finding base words - problem

[hkke420]

IIRC OSX has BSD sed, not GNU sed.

Thanks for your response epixoip,

I have tried:
cat /Users/hkke/Desktop/wordlist/new.txt | tr A-Z a-z | sed -i 's/^[^a-z]*//g; s/[^a-z]*$//g; y/112345677890@\$\!\#/ilzeasbzvbgoasih/; s/[^a-z]//g; /^$/d'
sed: -i may not be used with stdin