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: ['9967', '3565', '1355', '1977', '8579', 'U', 'o', 'f', '2563', 'a', '6291', '8189', '7533', 'K', '1763', 'o', 'B', 't', '3625', 'R', '4191', 'F', 'E', '5219', '5481', '4193', '2873', 'D', '6105', 'g', 'n', 'c', 'U', '9697', '3401', '3677', 'H', '2253']

9967, 3565, 1355, 1977, 8579, 21, 15, 6, 2563, 1, 6291, 8189, 7533, 11, 1763, 15, 2, 20, 3625, 18, 4191, 6, 5, 5219, 5481, 4193, 2873, 4, 6105, 7, 14, 3, 21, 9697, 3401, 3677, 8, 2253