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: ['135', '1623', '9439', '1791', '4539', '9587', 'l', 'e', 'g', 'k', '6291', '4615', 'j', 'D', '7701', 'v', '4769', '5979', 'K', '9475', '4983']

135, 1623, 9439, 1791, 4539, 9587, 12, 5, 7, 11, 6291, 4615, 10, 4, 7701, 22, 4769, 5979, 11, 9475, 4983