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: ['6863', 'R', 'L', '2401', '7575', '5767', '5955', 'x', '9329', '2935', 'x', 'P', 'e']

6863, 18, 12, 2401, 7575, 5767, 5955, 24, 9329, 2935, 24, 16, 5