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: ['j', 'i', 'R', '5543', '8151', '2645', '6153', 't', '3823', 'D', '2549', 'O', '3299', 't', 'l', '9817', '9745', '1887', 'K', '8041', 'l', '3289', 'l', '859', '9913', '3299', 'o', 'i']

10, 9, 18, 5543, 8151, 2645, 6153, 20, 3823, 4, 2549, 15, 3299, 20, 12, 9817, 9745, 1887, 11, 8041, 12, 3289, 12, 859, 9913, 3299, 15, 9