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: ['A', '2651', 'L', 'X', '7363', 'P', '5937', '9133', 'P', 'y', 'Z', 'L', '7739', '5091', 'N', 'p', 'o', 'h', '5257', '6333', '8353', 'z', 'Y', 'm', 'n', '2121']

1, 2651, 12, 24, 7363, 16, 5937, 9133, 16, 25, 26, 12, 7739, 5091, 14, 16, 15, 8, 5257, 6333, 8353, 26, 25, 13, 14, 2121