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', '7869', 'D', '2991', 'p', 'M', '43', '9893', 'v', '5031', 'W', '8151', '765', 'T', '4237', 'A', 'X', 'l', '633', 'j', '7621', '7293', 'K', 'X', '3837', 'H', 'L', '8733', '6175', '9755', 'J', '8385']

16, 7869, 4, 2991, 16, 13, 43, 9893, 22, 5031, 23, 8151, 765, 20, 4237, 1, 24, 12, 633, 10, 7621, 7293, 11, 24, 3837, 8, 12, 8733, 6175, 9755, 10, 8385