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: ['1107', 'C', '5921', '7815', '1509', 'l']

SOLUTION: 1107, 3, 5921, 7815, 1509, 12

PROBLEM: ['a', 'w', 'n', 'R', 'u', 'z']

SOLUTION: 1, 23, 14, 18, 21, 26

PROBLEM: ['e', 'V', 'w', '137', 'N', 'J', '5581', 'F', '1293', 'l', 'l', '9973', '8943', 'x', '3647', '5273', 'w', '6323', 'V', '8377', '8977', '4033', '1685', 'D', '3709', 'g', '6997', 'F', 'v', 'H', '7383', '8897', 'R', 'Z', '581', '7661']

SOLUTION:
5, 22, 23, 137, 14, 10, 5581, 6, 1293, 12, 12, 9973, 8943, 24, 3647, 5273, 23, 6323, 22, 8377, 8977, 4033, 1685, 4, 3709, 7, 6997, 6, 22, 8, 7383, 8897, 18, 26, 581, 7661