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: ['8957', 'U', 'X', '289', '5467', 'e', '8953', '1295', '8719', '6529', '7173', 'D', '9957', '55', '7567', 'k', 'l', '1651', 'Y', 'Z']

8957, 21, 24, 289, 5467, 5, 8953, 1295, 8719, 6529, 7173, 4, 9957, 55, 7567, 11, 12, 1651, 25, 26