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: ['215', 'Y', '9137', 'C', 'l', '1909', 'a', 'W', '6605', '3773', '5165', '2895', 'z', '1285', '6299', '4107', 'd', 'O', 'p', 'u', '3043', 'W', 'z', 'h', '8637', 'g', '8829', 'y', 'g', 'u', '3227', 'D', '8507', '773', 'g', '4117']

215, 25, 9137, 3, 12, 1909, 1, 23, 6605, 3773, 5165, 2895, 26, 1285, 6299, 4107, 4, 15, 16, 21, 3043, 23, 26, 8, 8637, 7, 8829, 25, 7, 21, 3227, 4, 8507, 773, 7, 4117