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: ['p', '3493', 't', '7289', '9153', 'p', 'F', 'd', 'L', 'j', '3353', 'o', '5781', '2055', 'h', '8563', '1447', 'n', '4379', '6799', 'E', 'p', 'C', 'F', 'b', '8537', 'W', '7807', '7551', 'H', '2539', '3149']

16, 3493, 20, 7289, 9153, 16, 6, 4, 12, 10, 3353, 15, 5781, 2055, 8, 8563, 1447, 14, 4379, 6799, 5, 16, 3, 6, 2, 8537, 23, 7807, 7551, 8, 2539, 3149