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: ['t', 'U', '4407', '8601', 'd', 'D', '1209', '7387', 'A', '6899', 'k', '653', '1929', '4271', 'a', '997', 'Z', 'S', 'A', 'Z', 'o', 'E', 'p', 'Q', 'r', 'J']

SOLUTION: 20, 21, 4407, 8601, 4, 4, 1209, 7387, 1, 6899, 11, 653, 1929, 4271, 1, 997, 26, 19, 1, 26, 15, 5, 16, 17, 18, 10

PROBLEM: ['g', '9107', '351', 'a', '8693', 'O', 'I', '3675', '3883', '2709', '3999', '8265', '7627', '7041', '7799', 'U']

SOLUTION: 7, 9107, 351, 1, 8693, 15, 9, 3675, 3883, 2709, 3999, 8265, 7627, 7041, 7799, 21

PROBLEM: ['3801', '5101', 'g', '5969', 't', '49']

SOLUTION:
3801, 5101, 7, 5969, 20, 49