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.
Input: ['5001', '3109', 'W', '3535', '7621', 'r', 'f', 'D', '2227', 'g', '6571', 'R', '6395', '1335', 'd', '6617', 'C', '1073', '3327', '391', 'O', '9925', '4481', '1383', '9531', '2635', 'r', '7163', '4169', '449', 'J', 'f', '627', '1949', 'F']

5001, 3109, 23, 3535, 7621, 18, 6, 4, 2227, 7, 6571, 18, 6395, 1335, 4, 6617, 3, 1073, 3327, 391, 15, 9925, 4481, 1383, 9531, 2635, 18, 7163, 4169, 449, 10, 6, 627, 1949, 6