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: ['5923', 'A', 'Y', 'P', '5741', '4423', 'd', 'I', '7727', 'd', 's', 'O']

5923, 1, 25, 16, 5741, 4423, 4, 9, 7727, 4, 19, 15