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: ['P', 'q', 'g', 'a', '6555', 'f', 't', 'j', 'K', '9429', 'K', '4627', 'p', '6077', '2139', 'n', 'H', '9303', '6859', '4339', '4979', '6407', 'Y', 'o', 'Z', '441', '5865']

16, 17, 7, 1, 6555, 6, 20, 10, 11, 9429, 11, 4627, 16, 6077, 2139, 14, 8, 9303, 6859, 4339, 4979, 6407, 25, 15, 26, 441, 5865