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: ['1239', '6681', 'r', 'q', '5067', 'S', 'Q', '9025', '8907', 'C', '4627', '1395', 'f', 'e', '7859', '1221', '953', '4929', 'X', 'T', 'B', '3203', 'v', '4429', 'p', 'H', 'M', '2871']

1239, 6681, 18, 17, 5067, 19, 17, 9025, 8907, 3, 4627, 1395, 6, 5, 7859, 1221, 953, 4929, 24, 20, 2, 3203, 22, 4429, 16, 8, 13, 2871