how frequently does the letter "r" appear in:
dr. jing-yi lu is an assistant professor in the department of healthcare administration at asia university. she obtained her phd degree from department of adult and continuing education at national chung cheng university in 2018. after that, she has two years been a project manager of center for active aging and technology innovation, and been an adjunct assistant professor of general education center at tunghai university, which she implemented university social responsibility project for construct the support systems of elderly service and offer the elderly relevant courses. she has published in academic journals various articles on elder education design, the motivations and benefits of older adults’ cooperative learning, and proactive aging for elderly. her main research interests lie in senior education, elderly activity design, proactive aging and service learning for elderly, and long-term care for talent cultivation.

user
There are fifty-nine "r"s.
assistant