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: ['3515', '5271', '4907', '4935', '7597', '5125', 'g', '8455', 'j', 'Y', '4277', '9577', 'W', '5615', 'u', 'r', '5171']

SOLUTION: 3515, 5271, 4907, 4935, 7597, 5125, 7, 8455, 10, 25, 4277, 9577, 23, 5615, 21, 18, 5171

PROBLEM: ['S', 'D', '6375', '59', '8823', 's', '2591', '3923', '351', 'z', 'm', '1257', '1239', 'm', '2945', 'E']

SOLUTION: 19, 4, 6375, 59, 8823, 19, 2591, 3923, 351, 26, 13, 1257, 1239, 13, 2945, 5

PROBLEM: ['n', 'u', 'g', 'V', '1545', 'a', 'O', 'y', 'J', '5727', 'n', '8475', 'l', '5589', 'Z', 'O']

SOLUTION:
14, 21, 7, 22, 1545, 1, 15, 25, 10, 5727, 14, 8475, 12, 5589, 26, 15