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: ['1753', 'A', 'l', 'i', '7875', '133', '4981', '9233', '7701', 'D', '9909', 'm', '4197', '6359', 'K', 'f', 'j', 's', 'H', '8281', 'H', '555', '5599', '3285', '1779', '819', 'F', '8661']

1753, 1, 12, 9, 7875, 133, 4981, 9233, 7701, 4, 9909, 13, 4197, 6359, 11, 6, 10, 19, 8, 8281, 8, 555, 5599, 3285, 1779, 819, 6, 8661