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: ['e', 'D', 'q', 'S', '8519', 'X', '1191', 'T', 'o', '2859', 'b', 'l', '1789', '2227', '4605', '7623', '3553', '4733', '1291', '6969', '6091', 'Z', '4843', 'g', 't', 'W', '2427', '7659', '19', 'F']

5, 4, 17, 19, 8519, 24, 1191, 20, 15, 2859, 2, 12, 1789, 2227, 4605, 7623, 3553, 4733, 1291, 6969, 6091, 26, 4843, 7, 20, 23, 2427, 7659, 19, 6