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: ['F', '3545', '6423', 'P', '2683', 'Q', '8501', 'h', '8645', '1889', '5385', '3383', 'U', '1743', 'c', 'u', '5425', 'H', 'S', '8649', '9181', '3341', 'L', '8451', 'R', '991', '8373', '7033', '2119', '9457', 'u', '1681', 'Z', '603', 'R', 'G', '8687', '9481', '6657', '8203']

6, 3545, 6423, 16, 2683, 17, 8501, 8, 8645, 1889, 5385, 3383, 21, 1743, 3, 21, 5425, 8, 19, 8649, 9181, 3341, 12, 8451, 18, 991, 8373, 7033, 2119, 9457, 21, 1681, 26, 603, 18, 7, 8687, 9481, 6657, 8203