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: ['7561', '7313', '5065', 'k', 's', 'f', 't', 'P', 'R', '5775']

7561, 7313, 5065, 11, 19, 6, 20, 16, 18, 5775