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: ['s', 'T', '537', '517', 'k', 'U', '4471', 'i', '1213', 'A', '7543', 'p', 'f', '2367', 'V', 'T', '9505', '2131', 'Z', '7793', 'd', 'O', 'D', '5449', '8143', 'f', 'Q', '5425', '5955', 't', 'j', 'J', '807', '3885', 'D', '2477', '8705', 'y', '8015']

19, 20, 537, 517, 11, 21, 4471, 9, 1213, 1, 7543, 16, 6, 2367, 22, 20, 9505, 2131, 26, 7793, 4, 15, 4, 5449, 8143, 6, 17, 5425, 5955, 20, 10, 10, 807, 3885, 4, 2477, 8705, 25, 8015