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: ['Y', 'n', '6055', '4375', 'A', 'H', 'K', 'z', '7337', '7327', 'H', '1667', '8123', '2519', 'm']

25, 14, 6055, 4375, 1, 8, 11, 26, 7337, 7327, 8, 1667, 8123, 2519, 13