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: ['5481', 'W', '1285', 'U', '6155', '1505', 'Z']

SOLUTION: 5481, 23, 1285, 21, 6155, 1505, 26

PROBLEM: ['1207', 'B', '4273', '7081', '6009', '3933', '5589', '1543', '2631']

SOLUTION: 1207, 2, 4273, 7081, 6009, 3933, 5589, 1543, 2631

PROBLEM: ['Y', '9961', 'Q', 'H', '1265', 'V', '1929', 'e', '2419', 'Z', 'u', '4861', '1123', '4655', 'R', 'I']

SOLUTION:
25, 9961, 17, 8, 1265, 22, 1929, 5, 2419, 26, 21, 4861, 1123, 4655, 18, 9