s/^/a\n(zyxwvutsrqponmlkjihgfedcbA)/
:
s/(*@\w\(.*\(.\)\))/\2@\1)/
t
s/@//g
/)>/s/\n/@X&/g
/)v/s/\w*.(/&@&/
s/.)./)/
t
s/(.*//