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: ['r', '4281', '91']

SOLUTION: 18, 4281, 91

PROBLEM: ['9003', 'i', '881', 'l', 'f', '2663', '1619', 'Y', 'E', 'W', '2869', 'k', 'v', 'c', '9423', 'S', 'G', 'C', 's', '4311', '531', '9789', '937', 'F']

SOLUTION: 9003, 9, 881, 12, 6, 2663, 1619, 25, 5, 23, 2869, 11, 22, 3, 9423, 19, 7, 3, 19, 4311, 531, 9789, 937, 6

PROBLEM: ['2713', 'h', '4303', 'Z', '5281', '4635', 'G', 'u', '6719', 'm', '65', 's', '6595', '3443', 'l', '2347', '6785', 'd', 't', 'g', 'S', 'H', '3473', '1341', '5311', '6935', '6821', '8385', 'N', 'a', '7875', 'K', 'K', 'F', '1615', 'u']

SOLUTION:
2713, 8, 4303, 26, 5281, 4635, 7, 21, 6719, 13, 65, 19, 6595, 3443, 12, 2347, 6785, 4, 20, 7, 19, 8, 3473, 1341, 5311, 6935, 6821, 8385, 14, 1, 7875, 11, 11, 6, 1615, 21