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: ['a', 'f', 'k', '2457', 'l', 'P', 'b', '7883', '3743']

SOLUTION: 1, 6, 11, 2457, 12, 16, 2, 7883, 3743

PROBLEM: ['8643', 'H', 'g', '7997', '4131', 'c', '7125', 'Z', '2811', '3543', '269', 'Y', 'E', 'R', 'A', '2241', 'G', '9967', '3141', 'B', 'Y', 'A', '3263', 'c', '251', 'D', 'z', '5509', '1805']

SOLUTION: 8643, 8, 7, 7997, 4131, 3, 7125, 26, 2811, 3543, 269, 25, 5, 18, 1, 2241, 7, 9967, 3141, 2, 25, 1, 3263, 3, 251, 4, 26, 5509, 1805

PROBLEM: ['l', 'p', '1313', '7167', 'l', 'Y', '8035', '5613', '433', '4959', '1471', '5165', '4047', '3047', 'K', '6355', 'I', 'J', '625', 'F', '1807', '945', 'R', '9421', '2321', 'B', '9011', 'W', 'N', 'E', '7757', 'k', 'z', '9763', '4633', 'v']

SOLUTION:
12, 16, 1313, 7167, 12, 25, 8035, 5613, 433, 4959, 1471, 5165, 4047, 3047, 11, 6355, 9, 10, 625, 6, 1807, 945, 18, 9421, 2321, 2, 9011, 23, 14, 5, 7757, 11, 26, 9763, 4633, 22