Shortcut key to get to beginniing of line in R?

This is a generalize question: basically, say you are typing a long line of
command in R console, and then you realize you forgot to add something in
the beginning, is there a way to get to the beginning of the line without
pressing the "left" key on the keyboard and waiting for the cursor to get to
the beginning, or using the mouse?

I'm using windows version of R.

Thanks!

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