Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['u', 'a', 'i', '2729', '9773', 'O', '1411', '1347', 'L', '7365', '4381', 'r', 'b', '6205', '8353', '7931', '1797', 'w', 'K']

21, 1, 9, 2729, 9773, 15, 1411, 1347, 12, 7365, 4381, 18, 2, 6205, 8353, 7931, 1797, 23, 11