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: ['p', 'Y', '965', '9899', 'K', '4125', 'Y', '8971', 'u', 'K', 'd', '515', '527', 'm', 't', 'z', '4149', '261', '4789', '2889', '4257', '4955', '4841', 'I', '1009', '9483', '5753', 'E', '9319', 'z', 'A', '6761', 'P', '6657', '4757', '5437', 'A']

16, 25, 965, 9899, 11, 4125, 25, 8971, 21, 11, 4, 515, 527, 13, 20, 26, 4149, 261, 4789, 2889, 4257, 4955, 4841, 9, 1009, 9483, 5753, 5, 9319, 26, 1, 6761, 16, 6657, 4757, 5437, 1