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: ['b', 't', 'y', 'Y', '8137', '4055', '2661', 'E', '509', 'j', 'D', '6811', '2999', 'M', '1141', '9703', 'w', '9145', 'D', '8257', 'X', 'L']

2, 20, 25, 25, 8137, 4055, 2661, 5, 509, 10, 4, 6811, 2999, 13, 1141, 9703, 23, 9145, 4, 8257, 24, 12