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: ['4759', '2983', '8719', '3873', 'f', '1693', 's', '2717', '4149', '4889', 'n', 'T', '9679', 'o', '9625', 'Y', 'J', 'y', 'u', '933', 'k', '3141', 'c', 'F', 'z', 'O', '9335', '9205', '4075', '65']

4759, 2983, 8719, 3873, 6, 1693, 19, 2717, 4149, 4889, 14, 20, 9679, 15, 9625, 25, 10, 25, 21, 933, 11, 3141, 3, 6, 26, 15, 9335, 9205, 4075, 65