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', 'r', 'W', 'Y', 'u', 'y', '8693', 'j', '6749', '4209', 'e', '577', '7047', 'S', '1675', '7107', 'b', '6319', '1337', '717', 'X', '993', 'c', '5703', 'o', 'D', '583', '2299', '7787', 'i', '67', 'w', '5299', 'H', 'N', '2013', '4799', 'i', 'a', 't']

19, 18, 23, 25, 21, 25, 8693, 10, 6749, 4209, 5, 577, 7047, 19, 1675, 7107, 2, 6319, 1337, 717, 24, 993, 3, 5703, 15, 4, 583, 2299, 7787, 9, 67, 23, 5299, 8, 14, 2013, 4799, 9, 1, 20