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: ['S', '1901', '8071', 'g', '2455', 't', '6117', '4309', '7123', 'T', 'Q', '4489', '573', 'W', '1023', '4711', '6763', 'n', 's', 'g', '3247', '4285', '4405', 'C', '4849', '9717', 'n', '9487', '8385', 'R', 'S', 's', '8203', 'l']

19, 1901, 8071, 7, 2455, 20, 6117, 4309, 7123, 20, 17, 4489, 573, 23, 1023, 4711, 6763, 14, 19, 7, 3247, 4285, 4405, 3, 4849, 9717, 14, 9487, 8385, 18, 19, 19, 8203, 12