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: ['s', '2499', 'g', '6231', 'q', 'Y', '1207', 'O', '2049', 'y', 'k', '1609', 'C', 'E', 'W', 'R', '6545', '5739', '5013', 'v', 'a', '6269', 'q', 'p', 'g', '9425', 'F', '2863', 'u', '3121', '4287', 'R', '6975', '4277', '5873', '7059', '6299']

19, 2499, 7, 6231, 17, 25, 1207, 15, 2049, 25, 11, 1609, 3, 5, 23, 18, 6545, 5739, 5013, 22, 1, 6269, 17, 16, 7, 9425, 6, 2863, 21, 3121, 4287, 18, 6975, 4277, 5873, 7059, 6299