def release_from_branch(ver):
    """Parse the release version from the provided 'branch'.

For example, if --group=openshift-3.9 then runtime.group_config.branch
will have the value rhaos-3.9-rhel-7. When passed to this function the
return value would be the number 3.9, where in considering '3.9' then
'3.9' is the RELEASE version.

This behavior is HIGHLY dependent on the format of the input
argument. Hence, why this function indicates the results are based on
the 'branch' variable. Arbitrary input will fail. Use of this implies
you read the docs.
    """
    return ver.split('-')[1]
