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: ['T', '4147', '9459', 'f', 'g', 'n', '3211', '3729', '6687', '4789', '4435', 't', '8255', '5555', 's', '333', 'P', '8961', '8343', '7739', '3555', 'I', '9305', '763', '8401', '8305', '1645', 'u', 'h']

20, 4147, 9459, 6, 7, 14, 3211, 3729, 6687, 4789, 4435, 20, 8255, 5555, 19, 333, 16, 8961, 8343, 7739, 3555, 9, 9305, 763, 8401, 8305, 1645, 21, 8