Given the task definition and input, reply with output. 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.

['2951', 'A', '8343', '8927', 'L', '9067', '2463', 'Z', 'e', 'U']

2951, 1, 8343, 8927, 12, 9067, 2463, 26, 5, 21