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: ['j', 'F', '51', '9865', '4689', 'X', '1827', '9627', '9399', 'o', '5543', '425', 'l', 'P', '1597', 'R', '3641', 'i', 's', '8397', 'S', 'u', '8639', 'd', 'k', '91', '6871', '4957', 'u', 'W', 's', 'T', '1969', '9239', '6429', 'o', '8019', '27', '7447']

10, 6, 51, 9865, 4689, 24, 1827, 9627, 9399, 15, 5543, 425, 12, 16, 1597, 18, 3641, 9, 19, 8397, 19, 21, 8639, 4, 11, 91, 6871, 4957, 21, 23, 19, 20, 1969, 9239, 6429, 15, 8019, 27, 7447