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: ['8799', '7705', 'n', '7923', '5883', '573', '4887', 'X', 'n', 'U', 'H', 'U', 'n', '5191', 'x', 'K', 'S', 'm', 'f', '1041', 'D', 'e', 'f', '7267', 'I', '3571', 'S', '9753', '6049', 'B', '8021', '4625', '6373', '629', '2019']

8799, 7705, 14, 7923, 5883, 573, 4887, 24, 14, 21, 8, 21, 14, 5191, 24, 11, 19, 13, 6, 1041, 4, 5, 6, 7267, 9, 3571, 19, 9753, 6049, 2, 8021, 4625, 6373, 629, 2019