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', '3613', '1431', 'I', 'C', '4595', '1449', 'A', 'j', 'e', 'O', '7969', 'Z', '855']

25, 3613, 1431, 9, 3, 4595, 1449, 1, 10, 5, 15, 7969, 26, 855