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: ['53', 'J', '3749', '5189', '1627', 'A', '8099', '929', '5581', 'X', 'd', 'D', '3931', 'j', 'P', '5869', '2693', 'S', 'r', 'R', 'D', '985', '6951', '3097', 'I', '8309', '5285', '6995', '4423', 'L', 'r', 's', 'O', 'x', 'n', 'M', '3541', '2183', '7021', '527']

53, 10, 3749, 5189, 1627, 1, 8099, 929, 5581, 24, 4, 4, 3931, 10, 16, 5869, 2693, 19, 18, 18, 4, 985, 6951, 3097, 9, 8309, 5285, 6995, 4423, 12, 18, 19, 15, 24, 14, 13, 3541, 2183, 7021, 527