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: ['1693', '8445', 'M', 'H', 'u', 'j', '4165', 'b', 'k', '3169', 'H', 'P', '1815', '893', 'F', 'D', '7269', '1925', '1445', 'J', '9909', 'S', 'O']

1693, 8445, 13, 8, 21, 10, 4165, 2, 11, 3169, 8, 16, 1815, 893, 6, 4, 7269, 1925, 1445, 10, 9909, 19, 15