TASK 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.
PROBLEM: ['9973', '4501', '3257', '7393', '2041', '1173', 'f', '3299', '1399', 'S', 'a', '7829', '2557', '6051', '7063', '2537', 'k', 'b', 'W', '9133', 'd']

SOLUTION: 9973, 4501, 3257, 7393, 2041, 1173, 6, 3299, 1399, 19, 1, 7829, 2557, 6051, 7063, 2537, 11, 2, 23, 9133, 4

PROBLEM: ['3413', '4665', '2153', '8219', '8355', 'D', '4185', 'n', '3321', '8425', 'Y', 'v', 'M', '2149', 'S', '8645', 'M', 'O', 'C', '1155', '3227', 'y', '9475', '7103', '4341', '2753', '8947', 'e', '3009', 's', 'b', '2817']

SOLUTION: 3413, 4665, 2153, 8219, 8355, 4, 4185, 14, 3321, 8425, 25, 22, 13, 2149, 19, 8645, 13, 15, 3, 1155, 3227, 25, 9475, 7103, 4341, 2753, 8947, 5, 3009, 19, 2, 2817

PROBLEM: ['7251', '1273', 'b', 'q', '9483', '7789', '6705', '1469', '8111', 'g', '4047', '6591', '1983', '7619', 'Q', '7965', '4119', '5195', 'i', 'v', 'y', 'u', '8073', 'Q', '159', '9393', 'V', '2515']

SOLUTION:
7251, 1273, 2, 17, 9483, 7789, 6705, 1469, 8111, 7, 4047, 6591, 1983, 7619, 17, 7965, 4119, 5195, 9, 22, 25, 21, 8073, 17, 159, 9393, 22, 2515