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: ['p', 'i', '6305', 'I', '7611', 'A', '7757', '903', '8045', '6835', '4159', 'C', '1615', 'V', 'Q', '9489', 'O', 'a', 'b', '7633', 'R', '7519', '4077', '9865', '6395', 'U', '6675', '9893', '3359', '635', '5863', 'W', 'X']

16, 9, 6305, 9, 7611, 1, 7757, 903, 8045, 6835, 4159, 3, 1615, 22, 17, 9489, 15, 1, 2, 7633, 18, 7519, 4077, 9865, 6395, 21, 6675, 9893, 3359, 635, 5863, 23, 24