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: ['8555', 'i', 'k', 'S', '2087', '3173', 'L', 'c', '6565', '5925', '7023', '723', '4561', '1783', '4133', '9889', '3921', '1277', '3951', 'B']

SOLUTION: 8555, 9, 11, 19, 2087, 3173, 12, 3, 6565, 5925, 7023, 723, 4561, 1783, 4133, 9889, 3921, 1277, 3951, 2

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: ['r', '6177', '8437', 'F', '6175', '221', 'z', 'L', '6395', '355', 'm', '6183', 'H', 'k', '8495', 'W', '9583', 'q', 'F', '1603', '3611', '4743', '8187', 'Y', 'P', '9499', 'F', 'a', 'Z', '707', 'd', '6047']

SOLUTION:
18, 6177, 8437, 6, 6175, 221, 26, 12, 6395, 355, 13, 6183, 8, 11, 8495, 23, 9583, 17, 6, 1603, 3611, 4743, 8187, 25, 16, 9499, 6, 1, 26, 707, 4, 6047