It's a simple phrase, but it's important to note that the word order in Welsh is different from English. In English, we say "I am in," but in Welsh, it's "Rydw in."
Here's a breakdown:
* Rydw is a contracted form of "Rwy'n," which means "I am."
* in is the Welsh word for "in."
So, "Rydw in" literally translates to "I am in."