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: ['2653', 'L', '215', '9997', 'Q', '815', '8941', 'R', '1889', '9621', '2089', 'T', '1433', 'x', 'a', '5019', '5455', '9667', '1479', 'x', 'H', 'h', 'W', 'V', '1687', 'c', '7383', '7475']

2653, 12, 215, 9997, 17, 815, 8941, 18, 1889, 9621, 2089, 20, 1433, 24, 1, 5019, 5455, 9667, 1479, 24, 8, 8, 23, 22, 1687, 3, 7383, 7475