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: ['5213', 'T', '3915', 'M', 't', '7969', 'm', '8055', 'W', '6253', 'I', '399', 'R', 'T', '9085', '3711', 'Q', '3569', 'c', '7807', '8951', 'I', 's', 'y', '9267', '4447']

5213, 20, 3915, 13, 20, 7969, 13, 8055, 23, 6253, 9, 399, 18, 20, 9085, 3711, 17, 3569, 3, 7807, 8951, 9, 19, 25, 9267, 4447