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: ['4391', 'x', 'c', '5205', '3509', 'd', 'V', '7635', 'Z', '4123', '8093', '7713', '9519', 'H']

4391, 24, 3, 5205, 3509, 4, 22, 7635, 26, 4123, 8093, 7713, 9519, 8