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: ['7271', '9901', 'a', '7683', 'a', 'x', 'H', 'E', '1975', '8523', 'j', '4005', 'P', '7847', '4119', 'V', '8219', 'Y', '7417', '9379', '73', 'I', 'S', '6571', '27', 'x', 'b', 'Y', '1323', '8141', 'I', 'a', '6415', 'N']

7271, 9901, 1, 7683, 1, 24, 8, 5, 1975, 8523, 10, 4005, 16, 7847, 4119, 22, 8219, 25, 7417, 9379, 73, 9, 19, 6571, 27, 24, 2, 25, 1323, 8141, 9, 1, 6415, 14