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: ['1123', 'k', 'C', 'd', '2241', '7071', '4293', 'R', '3105', '5259']

1123, 11, 3, 4, 2241, 7071, 4293, 18, 3105, 5259