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: ['Y', 'H', 'f', '9901', '3911', '429', 'P', 'h', 'q', '9969', '6951', '3805', 'L', 'G', '1393', '3379', 'D', 'C', 'e', 'g', 'X', '2053', '1707', '351', '1551', 'y', '6011', 'l', 'x', '1093', 'v', 'B', '6225', '7863']

25, 8, 6, 9901, 3911, 429, 16, 8, 17, 9969, 6951, 3805, 12, 7, 1393, 3379, 4, 3, 5, 7, 24, 2053, 1707, 351, 1551, 25, 6011, 12, 24, 1093, 22, 2, 6225, 7863