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: ['6437', '3375', '6529', 'G', '3351', '5563', '5349', '4505', 'V', 'l', '2255', 's', '3691', 'c', 'w']

SOLUTION: 6437, 3375, 6529, 7, 3351, 5563, 5349, 4505, 22, 12, 2255, 19, 3691, 3, 23

PROBLEM: ['w', '8855', 'L', '1153', '543', '7281', 'G', '9643', 'z', '4051', '2313', '7921', '8947', '1677', '7081', '8769', 'Z', '5045', '2391', 'M', '5341', '2881', '2117', 'f', '809', 'E', '595', 'D', 'l', '8877', 'd']

SOLUTION: 23, 8855, 12, 1153, 543, 7281, 7, 9643, 26, 4051, 2313, 7921, 8947, 1677, 7081, 8769, 26, 5045, 2391, 13, 5341, 2881, 2117, 6, 809, 5, 595, 4, 12, 8877, 4

PROBLEM: ['R', '8541', '2621', 'h', '4337', 'I', 'r', '3123', '4199', 'a', '7637', '5239', 'Z', '9131', '3229']

SOLUTION:
18, 8541, 2621, 8, 4337, 9, 18, 3123, 4199, 1, 7637, 5239, 26, 9131, 3229