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: ['i', '5103', '9407', '6703', 'q', 'W', 'y', '2667', '1847', '2019', 'Z', '6393', '2369', 'i', '3965', '3439', 'y', '4237', 'e']

SOLUTION: 9, 5103, 9407, 6703, 17, 23, 25, 2667, 1847, 2019, 26, 6393, 2369, 9, 3965, 3439, 25, 4237, 5

PROBLEM: ['R', '5811', '8603', '8417', 'z', 'F', '3247', 'E', '1411', '6897', 'K', 'V', '7271', '1243', '5747', 'y', '5453']

SOLUTION: 18, 5811, 8603, 8417, 26, 6, 3247, 5, 1411, 6897, 11, 22, 7271, 1243, 5747, 25, 5453

PROBLEM: ['p', 'i', '1783', '3503', '499', '9345', '4711', '979', 'R', 'Y', '1357', '8515', '6081', 'Q', 'D', 'P', 'P', '349', 'P', 'T']

SOLUTION:
16, 9, 1783, 3503, 499, 9345, 4711, 979, 18, 25, 1357, 8515, 6081, 17, 4, 16, 16, 349, 16, 20