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: ['9893', 'V', 'c', '6043', 'y', 'w', '2483', 'J', '1637', '7077', '9631', '6441', 'r', 'N', 'y', '7571']

SOLUTION: 9893, 22, 3, 6043, 25, 23, 2483, 10, 1637, 7077, 9631, 6441, 18, 14, 25, 7571

PROBLEM: ['9961', 'Y', '669', '8227', 'j', 'c', '8749', 'c', 'K', '8439']

SOLUTION: 9961, 25, 669, 8227, 10, 3, 8749, 3, 11, 8439

PROBLEM: ['u', '4633', '4701', '8671', 'a', '9469', 'D', '3411', '87', 'b', '2115', 't', 'd', 'e', 'r', 't', 'w']

SOLUTION:
21, 4633, 4701, 8671, 1, 9469, 4, 3411, 87, 2, 2115, 20, 4, 5, 18, 20, 23