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: ['Z', 'm', '6871', '8253', '8445', 'A', '271', '7639', 'A', 'y', 'l', 'H', 'l', 'j', '5019', '29', 'F', 'u', '4853', 'W', 'f', 'F', '7645', '8097', '6173', '8271', 'E', 'Y', '3993', 'w']

26, 13, 6871, 8253, 8445, 1, 271, 7639, 1, 25, 12, 8, 12, 10, 5019, 29, 6, 21, 4853, 23, 6, 6, 7645, 8097, 6173, 8271, 5, 25, 3993, 23