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: ['5293', 'l', '753', 'z', 'Z', '4779', '4301', '267', '5409', 'S', '9933', '7281', '2339', 'n', '9079', '5043']

5293, 12, 753, 26, 26, 4779, 4301, 267, 5409, 19, 9933, 7281, 2339, 14, 9079, 5043