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: ['k', 'S', '6293', '4427', 'Y', 'T', 'z', '9499', 'h', 'E', 'd', '1271', 'C', 'j', 'o', '6511']

11, 19, 6293, 4427, 25, 20, 26, 9499, 8, 5, 4, 1271, 3, 10, 15, 6511