A few days ago, I (a student pilot on a solo) had landed on runway 9 for a full stop taxi back. The taxi instructions were "alpha to 27 remain on this frequency". I missed some words in between these instructions, but after responding "alpha to 27" there were no corrections, so I continued my taxi to 27. At this point I should have asked for clarification. A jet was landing and I was blocking the exit as I had taxied and was holding short of 27. ATC responded saying I was at the approach end of 27 and instructed me to do a 180 and taxi to runway 9 (they were very nice about it though).
I've been racking my brain trying to think what those missing words were. I can't imagine they'd have said departure end of 27 instead of just 9. This may be one of those moments I'll never figure out, but would anyone more experienced have any idea what might have happened?