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: ['6351', 'p', 'U', 'A', 'h', '1047', '5223', '6805', 'a', 'z', '9025', '1693', '547', '4619', 'd', 'W', '2955', 'q', '9147', '7185']

6351, 16, 21, 1, 8, 1047, 5223, 6805, 1, 26, 9025, 1693, 547, 4619, 4, 23, 2955, 17, 9147, 7185