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: ['5149', 'o', 'e', '6735', '5763', 'v', '7917', 'V', '9463', 'R', 'P', 'k', 'M', '9747', '3539', '1645', '733', '8127', 'b', 'P', '6363', 'y', 'U', 'Y', '9175', 'K', 'C', 'X', 'B', 'v', 't', '1477', 'm', 'W']

5149, 15, 5, 6735, 5763, 22, 7917, 22, 9463, 18, 16, 11, 13, 9747, 3539, 1645, 733, 8127, 2, 16, 6363, 25, 21, 25, 9175, 11, 3, 24, 2, 22, 20, 1477, 13, 23