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: ['6643', 'v', 'h', 'J', 'g', 'v', '8435', '3455', 'J', '429', 'T', '4221', 'f', '909', '3889', 'r', '7859', '6679', '2833', 'l', 'E', '7137', '631', '1327', 'f', '7241', 'A']

6643, 22, 8, 10, 7, 22, 8435, 3455, 10, 429, 20, 4221, 6, 909, 3889, 18, 7859, 6679, 2833, 12, 5, 7137, 631, 1327, 6, 7241, 1