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: ['B', '255', 'I', 'G', '2001', 'M', 'e', 'G', '7335', '3941', '2773', '5971', 'x', '2939', '6631', 'P', 'J', '7565', 'o', '7811', '847', 'i', 'J']

2, 255, 9, 7, 2001, 13, 5, 7, 7335, 3941, 2773, 5971, 24, 2939, 6631, 16, 10, 7565, 15, 7811, 847, 9, 10