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.

['1315', '4337', '877', '1395', '5039', '5537', '2249', '187', 'k', '2499', 'j', 'I', '2609', 'i', '1405', '6159', 'O', 'h', '7567', 'u', '105', '4017', 'y', 'O', '3739', '2501', 'v', 'D', '8021']
1315, 4337, 877, 1395, 5039, 5537, 2249, 187, 11, 2499, 10, 9, 2609, 9, 1405, 6159, 15, 8, 7567, 21, 105, 4017, 25, 15, 3739, 2501, 22, 4, 8021

['6877', 'l', 'd', 'n', '489', '1817', '2877', '883', '6965', 'L', '2219', 'A', '5233', 'G', 'Z', '219', 'O', 'j', 'T', '607', 'd', '4563', 'M', '7059', '4253', 'G', 'y', '5203', '3319', '5191']
6877, 12, 4, 14, 489, 1817, 2877, 883, 6965, 12, 2219, 1, 5233, 7, 26, 219, 15, 10, 20, 607, 4, 4563, 13, 7059, 4253, 7, 25, 5203, 3319, 5191

['W', '9721', 'h', '9103']

23, 9721, 8, 9103