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: ['I', 'A', 'Z', '9349', '4181', '5455', 's', 'z', '5435', 'r', 'R', '8625', 'F']

9, 1, 26, 9349, 4181, 5455, 19, 26, 5435, 18, 18, 8625, 6