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: ['s', 'o', '5351', 'z', 'X', '3189', '6407', 'x', '4121', '5161', '5019', '9601', '8961', '2939', '8915', 'a', '7905', 'T']

19, 15, 5351, 26, 24, 3189, 6407, 24, 4121, 5161, 5019, 9601, 8961, 2939, 8915, 1, 7905, 20