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: ['1315', '4337', '877', '1395', '5039', '5537', '2249', '187', 'k', '2499', 'j', 'I', '2609', 'i', '1405', '6159', 'O', 'h', '7567', 'u', '105', '4017', 'y', 'O', '3739', '2501', 'v', 'D', '8021']

SOLUTION: 1315, 4337, 877, 1395, 5039, 5537, 2249, 187, 11, 2499, 10, 9, 2609, 9, 1405, 6159, 15, 8, 7567, 21, 105, 4017, 25, 15, 3739, 2501, 22, 4, 8021

PROBLEM: ['o', '9845', '1599', '7901', '4987', '17', '2053', 'm', 'l', '1923', '9157', '817', '5361', '655', '2393', '8321', 's', '8605', 'l']

SOLUTION: 15, 9845, 1599, 7901, 4987, 17, 2053, 13, 12, 1923, 9157, 817, 5361, 655, 2393, 8321, 19, 8605, 12

PROBLEM: ['X', '9503', '5671', 'p', '3921', '6341', 'F', 'k', '3521', 'a', 'S']

SOLUTION:
24, 9503, 5671, 16, 3921, 6341, 6, 11, 3521, 1, 19