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: ['5071', 'I', 'r', 'm', '9873', '755', '2811', 'X', 'd', 'M', 'V', '4103', '6055', '7073', '3523', 'E', 'e', 'P', '1375', '4637', 'X', '2071', 'e']

5071, 9, 18, 13, 9873, 755, 2811, 24, 4, 13, 22, 4103, 6055, 7073, 3523, 5, 5, 16, 1375, 4637, 24, 2071, 5