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: ['8987', '5319', '2137', 'Z', 'e', '4997', '4895', '565', 'E', 'p', 'q', '3453', 'P', '8895', 'u', '7649', 'N', 'R', '3095', 'u', '8351', '3321', 'a', 'X', '273', '2769']

8987, 5319, 2137, 26, 5, 4997, 4895, 565, 5, 16, 17, 3453, 16, 8895, 21, 7649, 14, 18, 3095, 21, 8351, 3321, 1, 24, 273, 2769