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.

['3507', 'E', '6355', 'b', '9193', 'u', '249', 't', '2075', '7163', 'Z', 'm', 'M', '895', '9609', '4357', '7131', 'Q', '5231', 'h', '5511', '9355', '1369', 'O', 'Q', '6851', 'k', '659', '5297', '6175']
3507, 5, 6355, 2, 9193, 21, 249, 20, 2075, 7163, 26, 13, 13, 895, 9609, 4357, 7131, 17, 5231, 8, 5511, 9355, 1369, 15, 17, 6851, 11, 659, 5297, 6175