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: ['A', '3767', 'J', '8519', 'D', '2875', '1911', 'c', '7511', '1637', '1905', '9435', '7361', '8975']

1, 3767, 10, 8519, 4, 2875, 1911, 3, 7511, 1637, 1905, 9435, 7361, 8975