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: ['f', '2187', 'N', '2515', '2359', '585', '1541', 'N', 'v', '6261', 'c', 'N', '6933', 'y', 'd', '9613', '1565', '6163', '4453', 's', 'u', 'd', 'A', 'c', '4215', 'y', '1819', '1915', '4625', 'B', 'S', '9661', '1791', 'B']

6, 2187, 14, 2515, 2359, 585, 1541, 14, 22, 6261, 3, 14, 6933, 25, 4, 9613, 1565, 6163, 4453, 19, 21, 4, 1, 3, 4215, 25, 1819, 1915, 4625, 2, 19, 9661, 1791, 2