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: ['r', '1247', '5657', '4381', 'S', 'N', 'T', '8095', '255', '8739', '4843', '2149', '3873', 'y', '2553', 'H', '2257', 'f', 'n', '5983', '2463', 'H', 'g', '1863', '9339', 'O', '3021', 'n', 'g', 'h', 'Z', 'K', '5413', '3917', 'r', 'r']

18, 1247, 5657, 4381, 19, 14, 20, 8095, 255, 8739, 4843, 2149, 3873, 25, 2553, 8, 2257, 6, 14, 5983, 2463, 8, 7, 1863, 9339, 15, 3021, 14, 7, 8, 26, 11, 5413, 3917, 18, 18