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: ['u', 'V', '391', 'Y', '4173', '8295', 'd', '1677', '4391', 'S', 'W', 'U', '7061', 'e', '4461', '9111']

21, 22, 391, 25, 4173, 8295, 4, 1677, 4391, 19, 23, 21, 7061, 5, 4461, 9111