Generate automatic URL alias removing words
With just the Path module you can only edit each alias one by one manually. 

If you want more control than the Path module allows you can use the Pathauto module. That module has a setting listing all words to exclude from the generated paths. Delete the of and a from that list if that is what you need. There are also options about how to deal with many special characters under Punctuation settings. 

Be very careful with the # since it has meaning in URLs, it denotes an ID of an anchor on that page.