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: ['T', 'z', 'H', 'u', 'n', '6019', '8017', 'y', 'Y', 'F', 'A', 'd', 'M', 'u', '3777']

20, 26, 8, 21, 14, 6019, 8017, 25, 25, 6, 1, 4, 13, 21, 3777