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: ['847', 'l', '2511', '3347', '6247', '7189', 'm', '7703', '9907', 'P', '6949', 'd', 'f', '2561', '2375', '203', '5175', '5383', '6263', '6193', 'Z', 'Z', '6187', 'Y', 'N', 'P', '9449', 'Z', '665', '8417', '4313', '1361', 'a', 'R', '3711', '5043', '2289', 'x', 'A', '3569']

847, 12, 2511, 3347, 6247, 7189, 13, 7703, 9907, 16, 6949, 4, 6, 2561, 2375, 203, 5175, 5383, 6263, 6193, 26, 26, 6187, 25, 14, 16, 9449, 26, 665, 8417, 4313, 1361, 1, 18, 3711, 5043, 2289, 24, 1, 3569