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: ['1387', 'f', '1947', '7973', '9529', '6679', 'H', '1141', '75', '9965', '5537', '1931', 'J', '6617', 'Y', 'd', '2621', 'I', 'k', '233', '6885', 'm', '7807', 'w', 'J', '6877', 'P', 'd', 'Y', '4237', 'P', 'x']

1387, 6, 1947, 7973, 9529, 6679, 8, 1141, 75, 9965, 5537, 1931, 10, 6617, 25, 4, 2621, 9, 11, 233, 6885, 13, 7807, 23, 10, 6877, 16, 4, 25, 4237, 16, 24