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: ['A', '6307', 'n', 'U', '5179', 'X', 'N', '767', '8273', 'r', '7055', '9371', 'u', '7479', 'p', '9961', '3547', 'X', '8445']

SOLUTION: 1, 6307, 14, 21, 5179, 24, 14, 767, 8273, 18, 7055, 9371, 21, 7479, 16, 9961, 3547, 24, 8445

PROBLEM: ['D', '7557', '2965', 'N', 'd', 'R', '2845', 'f', '8165', 'Y', 'N', '4109', 't', '7323']

SOLUTION: 4, 7557, 2965, 14, 4, 18, 2845, 6, 8165, 25, 14, 4109, 20, 7323

PROBLEM: ['t', 'P', 'u', '9443']

SOLUTION:
20, 16, 21, 9443