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: ['s', '3183', '7969', '5227', 'Z', 'P', '2535', '7329', 'A', 'Q', '661', '7915', 'l', '9197', '2843', '2157', 'W', '5541', '9967', 'I']

19, 3183, 7969, 5227, 26, 16, 2535, 7329, 1, 17, 661, 7915, 12, 9197, 2843, 2157, 23, 5541, 9967, 9