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: ['7757', 'b', '1917', 'l', 'c', '1945', 'T', '2211', 'r', '8029', 'K', '8531', 'r', 'W', '2713', '1817', 'w', 't', '6047', '5081', '8087', 'N', 'L', '5053']

7757, 2, 1917, 12, 3, 1945, 20, 2211, 18, 8029, 11, 8531, 18, 23, 2713, 1817, 23, 20, 6047, 5081, 8087, 14, 12, 5053