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: ['1277', 'u', 'J', '7267', '4141', 'J', '7451', 'j', 'q', '1585', 'X', '6087', 'u', 'S', 'P', '9843', '7813', '1767', '149', '5773', '8171']

1277, 21, 10, 7267, 4141, 10, 7451, 10, 17, 1585, 24, 6087, 21, 19, 16, 9843, 7813, 1767, 149, 5773, 8171