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: ['5383', 'q', 'S', '1689', '2039', 'g', 'S', 'e', 'I', '4545', '9543', '7949', 'Y', '8895', '8043', '2083', '5249', '8511', 'A', '7883', '8813', '9423', '2553', '4049', '7801', '5319', '1609', 'R', '1557', 'E', 'a', 'l', '1033', '3367', 'c', '8319', '6763', 'M', '497', 'E']

5383, 17, 19, 1689, 2039, 7, 19, 5, 9, 4545, 9543, 7949, 25, 8895, 8043, 2083, 5249, 8511, 1, 7883, 8813, 9423, 2553, 4049, 7801, 5319, 1609, 18, 1557, 5, 1, 12, 1033, 3367, 3, 8319, 6763, 13, 497, 5