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: ['8981', 'T', 'S', 'C', '6477', 'a', 'M', '173', 'X', '5513', 'P', 'g', '379', '9121', '8455', '7513', 'A', 'K', '917', '5687', '5147', '7125', 'V', '7641', 'R', 'p', 'x', 'i', 'W', 'M', 'l', 'b', '4277', 'H', '3563']

8981, 20, 19, 3, 6477, 1, 13, 173, 24, 5513, 16, 7, 379, 9121, 8455, 7513, 1, 11, 917, 5687, 5147, 7125, 22, 7641, 18, 16, 24, 9, 23, 13, 12, 2, 4277, 8, 3563