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: ['b', '5319', 'v', 'R', '1999', '9315', 'x', 'w', '8901', '1649', 'K', 'V', '5485', '1299', 'y', 'j', 'x', 'Y', '5431', 'r', 'l', 'r', '7737', '7275', 'n', '7265', 'H', 'V', 'c', '5337', 'B', '2367']

2, 5319, 22, 18, 1999, 9315, 24, 23, 8901, 1649, 11, 22, 5485, 1299, 25, 10, 24, 25, 5431, 18, 12, 18, 7737, 7275, 14, 7265, 8, 22, 3, 5337, 2, 2367