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: ['7055', '3743', 'y', '437', 'i', '7763', '5891', 'b', 'W', '4643', 'J', '4205', '5771', '8183', '3507', '1455']

7055, 3743, 25, 437, 9, 7763, 5891, 2, 23, 4643, 10, 4205, 5771, 8183, 3507, 1455