Hole type: one-liner
Write a one-liner to read lines of input such as
12:ab:(##:45:X:3).:(31:3):2 and convert all the : to
- but only inside the parentheses. Parentheses will be balanced;
they will not be nested.
e.g.
12:ab:(##:45:X:3).:(31:3):2
->
12:ab:(##-45-X-3).:(31-3):2