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: ['7055', '7921', 'U', 'f', 'C', '3161', '1983', 'Q', 'X', 'b']

7055, 7921, 21, 6, 3, 3161, 1983, 17, 24, 2