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: ['t', '855', 'x', 'E', '6569', 'P', '2985', '767', '6427', '4061', '2493', 'Z', 'u', '8289', '5901', '3755', 'd', '4015', '1181']

SOLUTION: 20, 855, 24, 5, 6569, 16, 2985, 767, 6427, 4061, 2493, 26, 21, 8289, 5901, 3755, 4, 4015, 1181

PROBLEM: ['163', '235', 'N', 'k', '371', 'a']

SOLUTION: 163, 235, 14, 11, 371, 1

PROBLEM: ['c', 'C', 'I', '123', '803', '8265', 'r', '5627', 'D', 'U', '2945', 'f', 'N', '9371', '1987', '2873', '4511', 'O', 'i']

SOLUTION:
3, 3, 9, 123, 803, 8265, 18, 5627, 4, 21, 2945, 6, 14, 9371, 1987, 2873, 4511, 15, 9