Given an array of strings, return the words that can be typed using letters of the alphabet on only one row of American keyboard.

"Overall, the interview process was well structured and the communication from the recruiting team was helpful. I appreciated receiving preparation materials in advance and having clarity on what to expect from the different interview stages. The technical interview was challenging and gave me an opportunity to demonstrate my problem-solving approach. I felt the discussion was engaging, although I would have benefited from having more clarity around the expectations for the specific problem and additional time to explore and optimize my initial solution. The Googleyness and Leadership portion allowed me to reflect on my experiences with collaboration, leadership, and working through ambiguity. Overall, I found the process valuable and appreciated the opportunity to learn from the experience."