I have moved my site to wordpress. Now how do I move all my categories to tags?

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I just moved my blogger blog that has my own domain name to Wordpress. It was medium-easy to do with only a few problems due to a previous version of Wordpress in my ftp. Now that I am over the first part, my only question is this: How do I transfer all my tags (that have been put into categories on Wordpress) to tags on or for Wordpress ???