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: ['b', 'U', '8175', 'd', '5731', '493', 'a', 'V', 'S', 'L', 'W', 'z', 'D', '4529', '2923', '4063', 'b', '5529', '3871', 'X', '6937', '6395', '1057', 'X', 'f', 'Z']

2, 21, 8175, 4, 5731, 493, 1, 22, 19, 12, 23, 26, 4, 4529, 2923, 4063, 2, 5529, 3871, 24, 6937, 6395, 1057, 24, 6, 26