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: ['4345', '1815', '7973', '6187', 'U', '1133', '8791', '3555', 'i', 's', 'L', 'm', '7695', 'A']

SOLUTION: 4345, 1815, 7973, 6187, 21, 1133, 8791, 3555, 9, 19, 12, 13, 7695, 1

PROBLEM: ['S', 'h', 'O', 'j', 'f', 'Q', 'o', 's', 'r', '5617', '6939']

SOLUTION: 19, 8, 15, 10, 6, 17, 15, 19, 18, 5617, 6939

PROBLEM: ['8263', 'b', '929', '1715', 'F', '4609', 'A', 'B', 'w', 'i', '4627', 'u', '881', 'f', 'r', 'F', '73', 't', '1211']

SOLUTION:
8263, 2, 929, 1715, 6, 4609, 1, 2, 23, 9, 4627, 21, 881, 6, 18, 6, 73, 20, 1211