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: ['H', '6427', '5969', 'V', 'M', '6763']

8, 6427, 5969, 22, 13, 6763