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: ['9419', 't', '9383', 'o', 'Y', 'T', '5949', 's', '1957', 'O', 'w', '3573', 'W', 's', '9431', 'c', '6711']

SOLUTION: 9419, 20, 9383, 15, 25, 20, 5949, 19, 1957, 15, 23, 3573, 23, 19, 9431, 3, 6711

PROBLEM: ['u', 'P', 'n', 'P', '537', '6431', 'u', 'Y']

SOLUTION: 21, 16, 14, 16, 537, 6431, 21, 25

PROBLEM: ['J', '8933', 'I', '4371', 'A']

SOLUTION:
10, 8933, 9, 4371, 1