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: ['o', 'Y', 'M', '2619', '1487', '6409', '3229', '1859', '7327', '7813', '387', 'B', '1079', 'k', 'T', 'B', 'Y', 'A', 'b', 'e', 'L', 'z', '567', '7763', 'L', 's', '2231', '7485', 'D', 'x', '4625', 'H', '1007', 'S', '6393', 'u', '1099', '7531']

15, 25, 13, 2619, 1487, 6409, 3229, 1859, 7327, 7813, 387, 2, 1079, 11, 20, 2, 25, 1, 2, 5, 12, 26, 567, 7763, 12, 19, 2231, 7485, 4, 24, 4625, 8, 1007, 19, 6393, 21, 1099, 7531