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.

['8643', 'H', 'g', '7997', '4131', 'c', '7125', 'Z', '2811', '3543', '269', 'Y', 'E', 'R', 'A', '2241', 'G', '9967', '3141', 'B', 'Y', 'A', '3263', 'c', '251', 'D', 'z', '5509', '1805']
8643, 8, 7, 7997, 4131, 3, 7125, 26, 2811, 3543, 269, 25, 5, 18, 1, 2241, 7, 9967, 3141, 2, 25, 1, 3263, 3, 251, 4, 26, 5509, 1805

['r', '4281', '91']
18, 4281, 91

['5375', '8319', 'D', '5961', 'n', '2339', 'p', '2373', 'i', '7805', 'V', 'm', 'o', 'X', 'u', 'H', '7941', 'X', 'q']

5375, 8319, 4, 5961, 14, 2339, 16, 2373, 9, 7805, 22, 13, 15, 24, 21, 8, 7941, 24, 17