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', 'g', '2189', '4261', '4019', 'G', '4719', 'u', '4151', 'Z']

19, 7, 2189, 4261, 4019, 7, 4719, 21, 4151, 26