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: ['R', 'Q', 'E', '2153', 'q', 'd', '4599', '4507', '7691', '9607', 'U', 'o', 'g', 'h', 'S', 'l', '8125', '4111', 'r', '57', '617', '971']

18, 17, 5, 2153, 17, 4, 4599, 4507, 7691, 9607, 21, 15, 7, 8, 19, 12, 8125, 4111, 18, 57, 617, 971