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: ['1819', 'r', '9077', 'n', 'F', '5861', 'S', '6535', '6879', 'B', '3957', '533', 'x', '6101', 'S', 'l', 'a', '9249', 'K', '5479', '5497', '937', 'X', '7743', '2467', 'g', 'J', '9761', 'u', 'T', 'Y', '2487']

1819, 18, 9077, 14, 6, 5861, 19, 6535, 6879, 2, 3957, 533, 24, 6101, 19, 12, 1, 9249, 11, 5479, 5497, 937, 24, 7743, 2467, 7, 10, 9761, 21, 20, 25, 2487