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: ['l', '2907', 'x', 'y', 'Y', 'T', 'T', '4687', '9347', 'g', 'V', '1141', 'w', 'P', 'U', 'n', '9493', 'R', 'c', 'k', '5803', 'S', '2119', '9875', '4955', '9097', '7661', 'B', '6329', '7049', 'G']

12, 2907, 24, 25, 25, 20, 20, 4687, 9347, 7, 22, 1141, 23, 16, 21, 14, 9493, 18, 3, 11, 5803, 19, 2119, 9875, 4955, 9097, 7661, 2, 6329, 7049, 7