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: ['5909', '4373', 'D', '8173', 'T', 'A', 'r', 'Y', '1627', '1411', 'K']

5909, 4373, 4, 8173, 20, 1, 18, 25, 1627, 1411, 11