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: ['2553', '4571', '4181', '865', 'T', '9077', 'l', '9217', 'p', 'h', '9531', 'v', 'm', 'c', '6567', 'C', 'j', '4733', 'Z', 'u', '4601', 'U', '4987', 'M', 'x', '4081', '4277', 'P', 'u', 'p', 'A']

2553, 4571, 4181, 865, 20, 9077, 12, 9217, 16, 8, 9531, 22, 13, 3, 6567, 3, 10, 4733, 26, 21, 4601, 21, 4987, 13, 24, 4081, 4277, 16, 21, 16, 1