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: ['f', '5977', 'Q', 'o', '7887', '5727', '4075', '3035', 'W', '4259', '287', 'i', 'Z', 'u', '7449', '6417', '9969', '1821', 'I', '9313', '1893', 'd', '9817', 'U', 'c', '541', '467', 'J']

6, 5977, 17, 15, 7887, 5727, 4075, 3035, 23, 4259, 287, 9, 26, 21, 7449, 6417, 9969, 1821, 9, 9313, 1893, 4, 9817, 21, 3, 541, 467, 10