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', '1727', '8139', 'm', '605', 'Z', '8309', 'i', 'S', 'k', 'j', '5531', '5123', '6525', 'V', 'g', 'Z', 'z', '4765', '4567', '3539', '3387', 's', 'j', 'e', 'J', '7757', 'B', '6923', '2003', '9083', '2147', '5409', 'S', 'l', 'g', '1777', 'B', 'p']

15, 1727, 8139, 13, 605, 26, 8309, 9, 19, 11, 10, 5531, 5123, 6525, 22, 7, 26, 26, 4765, 4567, 3539, 3387, 19, 10, 5, 10, 7757, 2, 6923, 2003, 9083, 2147, 5409, 19, 12, 7, 1777, 2, 16