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: ['y', '7541', 'l', 'n', 'N', 'a', 'I', 'Y', 'h', 's', '9545', '6043', 'f', 'c', 'v', '7091', '2987', 'O', 'x', '4137', 'y', '1111', '4315', '1383', '9643', '9287', 'R', 'g', 'D', 'G', '7011']

25, 7541, 12, 14, 14, 1, 9, 25, 8, 19, 9545, 6043, 6, 3, 22, 7091, 2987, 15, 24, 4137, 25, 1111, 4315, 1383, 9643, 9287, 18, 7, 4, 7, 7011