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: ['9407', 's', '3757', '6925', '8457', '7659', '2961', '1895', 'x', 'E', '1765', 'G', 'F', '369', 'R', '7845', 'i', 'Z', 'U', '4169', 'V', '6981', '1495', '8703', '9079', '5695', 'Z']

9407, 19, 3757, 6925, 8457, 7659, 2961, 1895, 24, 5, 1765, 7, 6, 369, 18, 7845, 9, 26, 21, 4169, 22, 6981, 1495, 8703, 9079, 5695, 26