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: ['2775', 'F', '7189', 'x', 'p', '1521', '9637', '7973', 'u']

2775, 6, 7189, 24, 16, 1521, 9637, 7973, 21