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: ['j', '7569', 'n', '7483', 'J', 'F', 'a', 'Y', '6087', '8673', 'x', 'l', '2171', '4271', '639', '9053', 'K', '5623', 'p', 'q', '5775', '9285', 'q', '2665', '2439', 'b', '6389', '6901', '7347', '2133', '3953', '5141', '1185', 'N', '6863', 'K', '1821']

10, 7569, 14, 7483, 10, 6, 1, 25, 6087, 8673, 24, 12, 2171, 4271, 639, 9053, 11, 5623, 16, 17, 5775, 9285, 17, 2665, 2439, 2, 6389, 6901, 7347, 2133, 3953, 5141, 1185, 14, 6863, 11, 1821