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', '1657', '4747', '8743', 'Y', '9109', '1813', 'i', 'A', 'I', '5737', '4689', 'M', '2309', 'Y', '7055', 'Y', 'M', '2053', 'f', '3909', 'Y', '7329', 'o', '609', '217', 'S', 'Z']

1, 1657, 4747, 8743, 25, 9109, 1813, 9, 1, 9, 5737, 4689, 13, 2309, 25, 7055, 25, 13, 2053, 6, 3909, 25, 7329, 15, 609, 217, 19, 26