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: ['7739', '9017', 'P', '1833', 'z', '6497', 'C', 'y', '169', '4393', 'x', '5101', '3975', 'M', 'Z', 'c', 'p', '8547']

7739, 9017, 16, 1833, 26, 6497, 3, 25, 169, 4393, 24, 5101, 3975, 13, 26, 3, 16, 8547