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: ['q', '3261', '8121', 'q', 'f', '421', 'M', 'H', 'P', '833', 'D', '2121', 'x', '9965', 'p', 'U', '8175']

17, 3261, 8121, 17, 6, 421, 13, 8, 16, 833, 4, 2121, 24, 9965, 16, 21, 8175