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: ['O', 'B', 'm', 'K', 'F', '6191', 'c', 'T', '369', 'C', 'p', '3091', 'i', '9461', '2105', 'J', '7533', 'A', 'B', '8927', 'z', 'A']

15, 2, 13, 11, 6, 6191, 3, 20, 369, 3, 16, 3091, 9, 9461, 2105, 10, 7533, 1, 2, 8927, 26, 1