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: ['B', 'i', '8095', '4847', '6749', '615', 'I', '9871', 'u', '4753']

2, 9, 8095, 4847, 6749, 615, 9, 9871, 21, 4753