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', 'M', 'O', 'Z', 'A', 'W', 'n', '3019', '3969', 'b', 't', '1793']

2, 13, 15, 26, 1, 23, 14, 3019, 3969, 2, 20, 1793