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: ['C', 'y', '4799', '841', 'f', 's', 'L', '5945', '1677', '7213', '1757', '1133', 'P', 'o', '8191', '5831', '787', '993', '9439', '6897', '1359', '193', '9565', '4325', '7311', '3891', 'n', 'a', '6593', 'R']

3, 25, 4799, 841, 6, 19, 12, 5945, 1677, 7213, 1757, 1133, 16, 15, 8191, 5831, 787, 993, 9439, 6897, 1359, 193, 9565, 4325, 7311, 3891, 14, 1, 6593, 18