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: ['1673', 'N', '5493', 'X', 'u', 'T', 'B', '4687', '5247', 'B', 'x', 'O', '3231', 'S', 'L', 'i', '9781', 'B', '3347', 'u', '3775', 'g', 'z', '5361', '9131', 'z', 'B']

1673, 14, 5493, 24, 21, 20, 2, 4687, 5247, 2, 24, 15, 3231, 19, 12, 9, 9781, 2, 3347, 21, 3775, 7, 26, 5361, 9131, 26, 2