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: ['5473', '3897', 'E', '7551', 'U', 'l', 'C', 'p', 'w', 'g']

SOLUTION: 5473, 3897, 5, 7551, 21, 12, 3, 16, 23, 7

PROBLEM: ['2693', 'q', '1077', 'V', '4429', 'Y', '29', '3395', 'e', '5979', 'K', '3225', '4173']

SOLUTION: 2693, 17, 1077, 22, 4429, 25, 29, 3395, 5, 5979, 11, 3225, 4173

PROBLEM: ['I', 'l', '3397', '9913', 'q', '9631', '2829', '6489', 'S', '7083', 'd', 'h', '7433']

SOLUTION:
9, 12, 3397, 9913, 17, 9631, 2829, 6489, 19, 7083, 4, 8, 7433