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.

['R', '5811', '8603', '8417', 'z', 'F', '3247', 'E', '1411', '6897', 'K', 'V', '7271', '1243', '5747', 'y', '5453']
18, 5811, 8603, 8417, 26, 6, 3247, 5, 1411, 6897, 11, 22, 7271, 1243, 5747, 25, 5453

['W', '7533', '1447', '5111', '2125', 'F', 't', '1481', 'w', 'x', '6279', 'Y', '4167', 'P', 'y', '663', 'W', 'm', '3717', 'n']
23, 7533, 1447, 5111, 2125, 6, 20, 1481, 23, 24, 6279, 25, 4167, 16, 25, 663, 23, 13, 3717, 14

['4049', '4931', '6643', '5399', '6941', '1425', 'q', '6931', '4721', '9643', 'X', 'a', '7233', 'I', '657', '163', 'i', 'L', '2649', 'f', 'b', '9159']

4049, 4931, 6643, 5399, 6941, 1425, 17, 6931, 4721, 9643, 24, 1, 7233, 9, 657, 163, 9, 12, 2649, 6, 2, 9159