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.

['5209', 'd', 'C', 'x', '851', 'M', '8489', '9989', '6033', 'L', 'E', '9201', 'u', 'h', '1279', '9283', '9873', '259', '5015', '9735', 'R', 'J', '637', '4785', 'E', '4893', 'K', 'O']
5209, 4, 3, 24, 851, 13, 8489, 9989, 6033, 12, 5, 9201, 21, 8, 1279, 9283, 9873, 259, 5015, 9735, 18, 10, 637, 4785, 5, 4893, 11, 15

['f', '7711', 'h', '3301', 'L', 'K', 'T', 'E', 'Y', '947', '8391', '4785', 'Y', '1089', 'X', 'n', '2029', 'O', '8959', '4625', 'o', '5601', 'b', 'X', '29', '949', '9311', 'W', '8625', '9911']
6, 7711, 8, 3301, 12, 11, 20, 5, 25, 947, 8391, 4785, 25, 1089, 24, 14, 2029, 15, 8959, 4625, 15, 5601, 2, 24, 29, 949, 9311, 23, 8625, 9911

['S', '9519', '8927', 'U', '1967', 'O', '7089', 'M', '5003', '1311', 'z', '3555', 'i', '8339', 'J', '7473']

19, 9519, 8927, 21, 1967, 15, 7089, 13, 5003, 1311, 26, 3555, 9, 8339, 10, 7473