Off topic:Sed command for replacements

Question

[Maria333]

Hi,

Does anyone know how I can replace ":" with "-" in linux?

I was able to remove the spaces and substitute them with ":", but now I need to remove one of the two ":" and replace it with a "-". For example:

1:12000000:13000000

into

1:12000000-13000000

I have tried it in several ways and it just brings everything back to empty spaces.

Thank you