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: ['3095', '355', 'u', '7663', '6301', '2223', '7319', '4235', '1221', 'd', '2489', 'v', '3103', '1839', '3573', '5815', '4621', '1869']

3095, 355, 21, 7663, 6301, 2223, 7319, 4235, 1221, 4, 2489, 22, 3103, 1839, 3573, 5815, 4621, 1869