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: ['1537', '6061', '4177', 'R', '9393', 'y', '8891', 'h', '3061', 'S', 'E', '5347', '8437', '6149', '2585']

1537, 6061, 4177, 18, 9393, 25, 8891, 8, 3061, 19, 5, 5347, 8437, 6149, 2585