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: ['1939', '7465', 't', '8401', '161', '7451', 'd', 'H', '4957', '5765', '19', '8981', 'n', 'i', 'B', 'r', 'o', '6653', '3671', 'r', 'e', '2403', 'X', 'y', '4993', '6411', 'D', '4645', '5033', '7297']

SOLUTION: 1939, 7465, 20, 8401, 161, 7451, 4, 8, 4957, 5765, 19, 8981, 14, 9, 2, 18, 15, 6653, 3671, 18, 5, 2403, 24, 25, 4993, 6411, 4, 4645, 5033, 7297

PROBLEM: ['871', 'f', '2705', '773', '1661']

SOLUTION: 871, 6, 2705, 773, 1661

PROBLEM: ['u', '7037', 'n', '8121', '4611', '8897', '4247', 'u', 'w', 'a', 'N', '4153', '5099', '605', '4785', '8407', '6059', 'Q', '6395', '8267', 'S']

SOLUTION:
21, 7037, 14, 8121, 4611, 8897, 4247, 21, 23, 1, 14, 4153, 5099, 605, 4785, 8407, 6059, 17, 6395, 8267, 19