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', '8475', 'v', 'B', '7931', 'W', '1911', 'd', 'e', 'P', '7747', '7801', '7381', 'l', '5329', '5183', '8499', 'k', '7049', '7737', '2887', 'g', 'Y']

1, 8475, 22, 2, 7931, 23, 1911, 4, 5, 16, 7747, 7801, 7381, 12, 5329, 5183, 8499, 11, 7049, 7737, 2887, 7, 25