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: ['F', '5423', '4407', '5723', 'l', '5383']

SOLUTION: 6, 5423, 4407, 5723, 12, 5383

PROBLEM: ['C', '4013', '5207', 'd', '2581', '5705', 'R', '147', 'd', '1413', 'A', '7935', 'F', 'k', 'P', 'N', '4181', 's', '1143', '9377', '683', '3131', 'T', 'Z']

SOLUTION:
3, 4013, 5207, 4, 2581, 5705, 18, 147, 4, 1413, 1, 7935, 6, 11, 16, 14, 4181, 19, 1143, 9377, 683, 3131, 20, 26