Inserting special characters in between letters in a wordlist??

[mad_hashcatter]

If I want to insert a symbol (hyphen-minus for example) between all the characters in a wordlist

list:
cheese
butter
bread

candidates:

c-h-e-e-s-e
b-u-t-t-e-r
b-r-e-a-d

etc.

What is the best way to achieve this? TIA.