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', '3457', 'Z', '5467', 'E', 'x', 'n', '319', 'T', 'z', 'O', '8531', 'z', '4829', '5263', '3953', 'R', 'Z', 'H', '8803', '4025', 's', 'X', 'e', '8771', '5701', 'S', 'K', '7803', '4187', 'Y', '7779', '2481', 'e', 'B', 'x', 'Q', '9711', 'v', 'f']

18, 3457, 26, 5467, 5, 24, 14, 319, 20, 26, 15, 8531, 26, 4829, 5263, 3953, 18, 26, 8, 8803, 4025, 19, 24, 5, 8771, 5701, 19, 11, 7803, 4187, 25, 7779, 2481, 5, 2, 24, 17, 9711, 22, 6