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: ['2295', 'a', 'r', 'j', '6985', 'U', '9149', 'U', 'C']

2295, 1, 18, 10, 6985, 21, 9149, 21, 3