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: ['6681', '2493', 'o', 'I', '6791', '2641', 'W', 'd', '3611', '1209', '2921', '7469', '7203', 't', '2109', 'G', '2901', '2743', '5333', 'Z', 'c', '7089', '8319', 'Z', 'w', '57', '5115', 'h', 'n', '5511']

6681, 2493, 15, 9, 6791, 2641, 23, 4, 3611, 1209, 2921, 7469, 7203, 20, 2109, 7, 2901, 2743, 5333, 26, 3, 7089, 8319, 26, 23, 57, 5115, 8, 14, 5511