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: ['A', '553', '8971', 'R', '7647', 'U', '7283', '597', 'q', 'i', '8619', '7175', '2169', 'O', '7281', 'i', '7247', 'm', 'I', '6025', '8295']

1, 553, 8971, 18, 7647, 21, 7283, 597, 17, 9, 8619, 7175, 2169, 15, 7281, 9, 7247, 13, 9, 6025, 8295