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: ['7149', '3915', 'k', 'Y', 'z', 'P', '775', 'v', 'U', '233', 'm', '2939', 'O', '6787', '7717', 'U', '8531', '5071', 'j', '7839', 'S', 'W', 'K', '3689', '8907', '7721', '9099', 'U', 'U', '53', '4025', 'J', '7179', '7587']

SOLUTION: 7149, 3915, 11, 25, 26, 16, 775, 22, 21, 233, 13, 2939, 15, 6787, 7717, 21, 8531, 5071, 10, 7839, 19, 23, 11, 3689, 8907, 7721, 9099, 21, 21, 53, 4025, 10, 7179, 7587

PROBLEM: ['x', '9267', '297', 'u', 'B', 'N', 'A']

SOLUTION: 24, 9267, 297, 21, 2, 14, 1

PROBLEM: ['5523', 'r', 't', '1839', 's', '1441', 'C', 'W', '4709', '5217', 'p', 'O', 't', '2919', 'q', '1215', 'D', '4763', 'J', 'H', '5143', 'r', '9065', '8519', '253', '61', '4377']

SOLUTION:
5523, 18, 20, 1839, 19, 1441, 3, 23, 4709, 5217, 16, 15, 20, 2919, 17, 1215, 4, 4763, 10, 8, 5143, 18, 9065, 8519, 253, 61, 4377