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: ['5973', 'L', '8751', '2937', '1865', '5765', 'q', 'P', 'u', '7731', '2579', '4921', '7223', 'p']

5973, 12, 8751, 2937, 1865, 5765, 17, 16, 21, 7731, 2579, 4921, 7223, 16