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: ['U', '7017', 'w', 'Z', 'T', 'X', '8699', 'S', 'R']

SOLUTION: 21, 7017, 23, 26, 20, 24, 8699, 19, 18

PROBLEM: ['7527', '6309', '1291', '3995', 'D', '5925', 'y', '6943', '5393', '7691', 'a', 'P', 'k', 'x', 'm', 'Q', '475', '4921', '1909', 'b', '7417', 'E', '7689', 'o', '3491', 'g', '7689', 'x', 'E']

SOLUTION: 7527, 6309, 1291, 3995, 4, 5925, 25, 6943, 5393, 7691, 1, 16, 11, 24, 13, 17, 475, 4921, 1909, 2, 7417, 5, 7689, 15, 3491, 7, 7689, 24, 5

PROBLEM: ['Y', 'A', '9149', '5801', '2287', '8075', '3425', '5353', '6359', '3423', 'z', '1187', 'I', '2389', 'S']

SOLUTION:
25, 1, 9149, 5801, 2287, 8075, 3425, 5353, 6359, 3423, 26, 1187, 9, 2389, 19