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: ['5735', 'x', '9163', 'M', 'B', 'u', '1423', '833', 'U', '3431', 'W', 'B', 'V', 'Z', 'Z', '1763', 'h', '5591', 'H']

5735, 24, 9163, 13, 2, 21, 1423, 833, 21, 3431, 23, 2, 22, 26, 26, 1763, 8, 5591, 8