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: ['607', 'R', '6523', '1943', '857', 'k', 'R', '6653', 'c', 'O', '2855', 'g', 'O', '8071', '655', '5107', 'd', 'Y', '7237', '2447']

607, 18, 6523, 1943, 857, 11, 18, 6653, 3, 15, 2855, 7, 15, 8071, 655, 5107, 4, 25, 7237, 2447